Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f05b65ce1bb2b7…

MALICIOUS

PDF

135.7 KB Created: 2021-09-05 02:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: beb4dcc1bb304b48affaaa849dab52fc SHA-1: b3918c1589a262c5bce787631f70fd6b98aa883b SHA-256: 82f05b65ce1bb2b7e9d6bbb20ecb441994a4ffa09eb97a63606782c1dbf90ba0
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains multiple links pointing to compromised WordPress sites, which in turn host further PDF files. This suggests a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4524

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/nu1ke7f90t8c1f7csq6eeg4js0/raluvalubirizadodogunir.pdf In PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/dpfe61ecp1fa3m11ge82c8o81g/sonaxagizupoj.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/3588511872.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/tetik.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5ed5bc3b8---8908374597.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8b825ba9In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hermeneutica+avan%C3%A7ada+pdfPDF link annotation

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