Malicious PDF — malware analysis report

Static analysis result for SHA-256 442c3d43faec1281…

MALICIOUS

PDF

37.3 KB Created: 2021-05-28 23:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 45b8bfa0abe90b3756de743253ca51d5 SHA-1: c405ff5f0d8a9def8fc827e24a8945fff3fe37c6 SHA-256: 442c3d43faec12812f44aa15ba27d5dd06eeb8731a29c8d81da188df7a00efc2
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The PDF employs an image-only lure, typical of phishing campaigns, and contains multiple external URIs pointing to compromised WordPress upload directories. These links likely serve as redirects to malicious content or phishing pages, indicating a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5715

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 https://garglob.ru/uplcv?utm_term=what+is+social+tourist+attractions+in+texas PDF link annotation
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d9660ea442bb72be3266bc8c6aaba59f/40050290653.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/hn59diajodpa3gb2qu8lb7r5d6/regevisiveronogiwisudok.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc4d6af3e25dd329e1c1bd3cd135ed2c/89044050200.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/50edb40353cefb5f316bbad641e4c258/90390634233.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/98713713986.pdfIn PDF document text

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