Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4355262186218e…

MALICIOUS

PDF

37.2 KB Created: 2021-06-19 07:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d70855080ab1d595605204d3c62b405b SHA-1: 7e539e914c382d8ab5e8b464e82fd53f839353b8 SHA-256: 8c4355262186218e2e81ec62354193a1ac8763e99a9b8449130682bcb39d9b86
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns. It contains multiple links pointing to compromised WordPress uploads, suggesting an attempt to host malicious content or redirect users. The ClamAV detection and ML classifier further support its malicious nature, indicating it likely serves as a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5922

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.deopendeur.org/imgUser/file/gorugonivujes.pdf In PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160809a47b5ce7---86984971057.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/34j4qvpjbs5nc83mbqsa7r9262/xawofarakilowotepowak.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cd16c44f25c---13784669376.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/66bb010facff60d392671e573b91a3ec/seletotiwet.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/80055199798.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160863e2801c2c---64171000894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=order+of+adjectives+worksheets+for+grade+7PDF link annotation

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