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How to identify toxic backlink patterns on Semrush

intermediate 8 min read Updated 2026-04-20
Quick Answer

Use Semrush's Backlink Audit tool to identify toxic backlink patterns by analyzing your link profile for spam signals, low-quality domains, and suspicious anchor text distributions. The tool provides automated toxicity scoring and pattern recognition to help you spot harmful linking schemes.

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Prerequisites

  • Active Semrush subscription
  • Basic understanding of backlink analysis
  • Domain added to Semrush projects
  • Knowledge of toxic link indicators

Step-by-Step Instructions

1

Access the Backlink Audit Tool

Navigate to Projects in your Semrush dashboard and select your domain. Click on Backlink Audit from the left sidebar under the SEO Toolkit section. If this is your first audit, click Start Audit to begin the initial crawl process.
Allow 24-48 hours for the initial audit to complete for comprehensive results.
2

Review the Toxicity Score Overview

On the audit dashboard, examine the Toxicity Score meter at the top. Click on Toxic and Potentially Toxic segments to view problematic backlinks. Review the Toxic Markers section which shows common spam indicators like anchor text over-optimization, low authority domains, and suspicious link patterns.
3

Analyze Toxic Link Categories

Navigate to the Audit tab and filter results by Toxic status. Examine the Toxic Markers column to identify patterns such as:
  • Links from penalized domains
  • Suspicious anchor text ratios
  • Links from link farms or PBNs
  • Geographically irrelevant backlinks
Look for clusters of similar toxic markers across multiple domains.
Pay special attention to sudden spikes in toxic links that may indicate negative SEO attacks.
4

Examine Referring Domain Patterns

Click on the Referring Domains tab and sort by Authority Score in ascending order. Look for patterns in low-authority domains (score below 30) linking to your site. Check the Country column for unusual geographic distributions and examine IP addresses for C-class clustering by clicking on individual domains.
Multiple domains from the same IP range often indicate a private blog network (PBN).
5

Analyze Anchor Text Distribution

Go to the Anchors tab to review anchor text patterns. Look for over-optimization signs such as:
  • Exact match keywords appearing more than 10% of the time
  • Unnatural keyword stuffing in anchor texts
  • Foreign language anchors for English sites
  • Spammy phrases or adult content anchors
Use the Toxicity filter to focus on problematic anchor patterns.
6

Identify Link Velocity Anomalies

Access the Progress tab and examine the New & Lost Backlinks chart. Look for sudden spikes in link acquisition that could indicate artificial link building or negative SEO. Click on specific date ranges with unusual activity and review the New Backlinks list for quality and relevance patterns.
Natural link building typically shows gradual, steady growth rather than dramatic spikes.
7

Create Disavow Lists

After identifying toxic patterns, navigate back to the main Audit tab. Select toxic domains by checking the boxes next to problematic entries. Click Send to Disavow to add them to your disavow list. Use Remove from domain for entire domains or Remove URL for specific pages showing toxic patterns.
Always review the disavow list manually before submitting to Google Search Console to avoid disavowing legitimate links.
8

Schedule Regular Monitoring

Set up automated monitoring by clicking Settings in the Backlink Audit tool. Enable Weekly email reports and set Toxicity threshold alerts. Configure the system to notify you when toxicity scores increase by more than 5% or when new suspicious linking patterns emerge.

Common Issues & Troubleshooting

Backlink audit shows incomplete data

Ensure your domain verification is complete in Project Settings and wait for the full crawl cycle (24-48 hours). Check if your domain has sufficient backlinks for comprehensive analysis.

False positive toxic links identified

Manually review flagged links by clicking on individual domains. Check the actual linking pages and domain authority. Use the Whitelist feature to mark legitimate links that were incorrectly flagged.

Cannot find specific toxic link patterns

Use the Advanced Filters option to create custom searches. Combine filters like Authority Score, Country, and Toxic Markers to narrow down specific pattern types you're investigating.

Disavow file export issues

Ensure you're using the correct format by downloading the Google-formatted disavow file from Semrush. Verify the file contains proper syntax with domain: or URL prefixes before uploading to Google Search Console.

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