Malicious PDF — malware analysis report

Static analysis result for SHA-256 b443056b2e72d209…

MALICIOUS

PDF

36.6 KB Created: 2021-06-09 04:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e38092a790b434e9989e8936dcad3530 SHA-1: 2dd7600b5928ce9e1e9c95bd5c10e2fec8e435e5 SHA-256: b443056b2e72d209be6a8006ba5b3c6884fb0b09ef077dd5b9c7d59e0eeba0a8
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing lure due to its image-only nature and embedded clickable link. The document contains multiple URLs pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect the user to malicious content or download further payloads. The presence of PDF_IMAGE_LURE and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6106

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 36 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://nomylo.ru/uplcv?utm_term=sourceforge+pdf+editor PDF link annotation
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608189d40832a---kewawimigonupunosud.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4fee9bbfa---nepexivuzinobabenu.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/c4aa661e3786b8b7aee7ae7eb496cf3f/puloribilizorapeboxinumag.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/s31krh32q5c3vp7n919v6kq2eg/tolipitevakuvogagege.pdfIn PDF document text
    • http://ahlhy.com/uploadsIn PDF document text

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