Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6768ee90fd214b…

MALICIOUS

PDF

38.7 KB Created: 2021-09-03 15:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 573940c903dbe14753b597cd80ae762d SHA-1: 3450d2b4209001e8f11cb4571a122ba559534469 SHA-256: 4f6768ee90fd214be6ff8ae952c86b8e4017eed35f6344e210eacc3eb4d8c147
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document's structure, being image-heavy with minimal text, further supports its use as a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8501

Heuristics 6

  • 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 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://chcial.ru/uplcv?utm_term=importance+of+filipino+values+pdf PDF link annotation
    • http://feynburg-uhren.de/uploads/71625469065.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/068b7ff176632a00fd63e018d5c738fa/951130521.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d801928241f9f2c69c0db36cb4d6946d/80901186661.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108e66295283---30316596995.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/jokematanuje.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/momesukuwudonomeror.pdfIn PDF document text
    • https://felicityokolo.com/file/jogofidajetewinefonigeri.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5b00369134cf9a569cd1d6f39ac26a5b/68583648194.pdfIn PDF document text
    • http://allasclub.com/campannas/file/makuvatusifokusaxukexo.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/86586963712.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/dutuwusudekemitubidis.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/61cc416094f6d5ae28ca8dff6d77bb58/12549658504.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/fapepilolagugadejape.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c91a0eb0349d7724f01561854494cIn PDF document text

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