Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a6cf14bd52f86f…

MALICIOUS

PDF

37.3 KB Created: 2021-06-25 22:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc84330c26691272dde2efa86c1cfe78 SHA-1: 9c36745a1582933037b53232ea6eb5f42e9e6a88 SHA-256: 31a6cf14bd52f86fdedc0eeb4dfa2508752b75f4075589d14246476ab1381df0
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains multiple links, several of which point to compromised WordPress upload directories, suggesting an attempt to host malicious content. The document body is heavily obfuscated, but the presence of external URIs and the overall structure indicate a likely attempt to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6864

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://chcial.ru/uplcv?utm_term=devil+may+cry+hd+collection+trophy+guide PDF link annotation
    • https://aduanaldelvalle.com/userfiles/file/resuzufasufididedutetep.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba20c5a6e---wunawobuforaneze.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/razavevakisenujoxudut.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/449011b62c1b11e6f4de739200ea0539/defipakadapajuvujojaral.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae370a944c5---74273629325.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/77597123200.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/66153816955.pdfIn PDF document text

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