Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfd764ee31c035b…

MALICIOUS

PDF

41.2 KB Created: 2021-09-02 16:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4cd398fa16ecaf4bd54e6ef329e7fe41 SHA-1: de4679ce857a657029f56bfd80229f28a0ae33e4 SHA-256: 0bfd764ee31c035b0a03e6fafd6fc39aed10459c4f5aded9966e004a1c13369d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to funnel users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=improper+integrals+solved+problems+pdf PDF link annotation
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c2d23511da69bf5c8670b68488509693/govunevug.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/0miuf3p0lnj5kgu52heorldull/76276240841.pdfIn PDF document text
    • http://asfalon.com/__files/file/86945435775.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c54b5eb04f751c9fb21d8fe91db5e09d/18292344054.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16114bd7d6ec82---69745341634.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/wazuwazerev.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/85d8aa5609719a1402cd3db1548ec34c/89462744965.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/donitasobopegumabudepe.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2c19cb28b---nusilelilonapawevuluze.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/vadivizikofudufudunekaris.pdfIn PDF document text

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