Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2171b1c859a0826…

MALICIOUS

PDF

74.8 KB Created: 2021-05-29 19:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0a1cbc1000b7288db37fb190bee4a1ee SHA-1: c79e622de2c1cadcd13ceb1a26056930dc1b339a SHA-256: e2171b1c859a0826ae920ad2ecb282bb8e2d86ccc8803db41f07ff8437979d58
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites utilizing the 'super-forms' or 'formcraft' plugins for file uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malicious content. The document body is heavily obfuscated and appears to be junk data, not user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8356

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://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/7qvg8sc500ro6l8demfrlhdadj/bumalugemefadisowajolobo.pdf In PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/a769c6287e5b61712b406f2dd4d0c8db/lizasekem.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/52982494573.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4314253e3---dasadidoruwomegexetewajo.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/4f7fec954f032195abca0edc8c6c6848/xelinikujejunikipopotesi.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aab3785ae68---rokaf.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607634b26eabd---mepepoluvimibogetugiroki.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4fd541840f431e52eb88e0c0a9f7aa83/vivaxudusamobajimom.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/363d551ab799c78f8c0d2f1ec9e3c47c/pukonaxozaj.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0a893b3a4---98671459726.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/jgbn30i12pdjvt6tg5j1ig4os5/52313464768.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607212110aadf---84906556052.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/4099e3c46ebe9f252af63e54cd9a8ce7/sujofunoxizibif.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/eeb5ae418131ed34e9604e0ca1fa7afa/kudizusuvew.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160894e9c8cb53---68020806311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cardiac+conduction+practice+worksheetPDF link annotation
    • http://medlab.webd.pl/upload/file/xedifedito.pdfIn PDF document text

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