Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35d7fafb11679ab…

MALICIOUS

PDF

38.9 KB Created: 2021-08-17 01:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d6ce3d40493fcf85561f9ed95f096329 SHA-1: 2ddf126c9c533de83099b2669b186da6546d3f5d SHA-256: e35d7fafb11679abbccdf47ad03bc42d279f0e32d0766b8f82d4882be56829bb
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is an image-only PDF, a common technique for phishing lures where a screenshot is presented as a document. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6851

Heuristics 6

  • 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 38 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. 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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/515ebbf6d2fa3f6f6838e76a69e1e692/77776294677.pdf In PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210719_47DAAC66852A6C46.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/jexisutebabukeba.pdfIn PDF document text
    • http://bio86.fr/fichiers/nakajizufovate.pdfIn PDF document text
    • https://olterus.com/contents//files/vawux.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/fuvawejodafawaduw.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/kedajekapurur.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/24321460989.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/lalosadaponafowoj.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/pojitokife.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cb0609134---17493615747.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/v59b0nr47b912f6n81am3vfmg2/perivozokugez.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/47428849140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=active+passive+present+simple+past+simple+exercises+pdfPDF link annotation

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