Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f85ebbd2bfe599…

MALICIOUS

PDF

37.2 KB Created: 2021-06-28 20:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b1c645b38af7538de2c6d5de886af5ae SHA-1: cd1552567d1a9398c7338c56a798b40082aad3ed SHA-256: 78f85ebbd2bfe599aca3660647ad8ed550a786a9834d66b4041fe8a98480a64d
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains multiple links pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious content. The document's structure and heuristics indicate it's designed to trick users into clicking these links, likely to download further payloads or engage in credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7320

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 37 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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 http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bed69cd00---bewazanofew.pdf In PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/vloh2o14iuru9huqj87jual492/61672623238.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607309a8d9a35---79628021249.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/55fe6086b68f8c17e95fd873bfb3515a/86661084483.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/0d172ff19285d6b8f41e0e5d6d981481/95271319733.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bdb953a13---17523755987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=syngamy+definition+biologyPDF link annotation

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