Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2555c6933ef16dd…

MALICIOUS

PDF

39.8 KB Created: 2021-09-15 12:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1f0276e9bfc4d2e2ce934206b87d58ef SHA-1: aceee2d993adfc98703f1f07df9483be217fb6e6 SHA-256: c2555c6933ef16dda73179b65c69c91e284edb295eb84062057600f8b43b6d4a
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing lure. The heuristics indicate it's an image-only document designed to trick users into clicking embedded links, which are numerous and point to various domains, some of which appear to be compromised CMS uploads. The primary link, 'https://inwebjor.ru/uplcv?utm_term=dav+class+8+maths+book', suggests a lure related to educational content, likely to disguise a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9743

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 39 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://inwebjor.ru/uplcv?utm_term=dav+class+8+maths+book PDF link annotation
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    • https://muratay.nl/userfiles/file/41599859156.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/61551174980.pdfIn PDF document text
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    • https://tainandentist.com/uploads/files/202109021058538047.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/93628656236.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/39698933402.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/mijurevixilefagaxaki.pdfIn PDF document text
    • https://dalba.net/other_files/File/sulodidepexokolizisulusi.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/33276402331.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/hk2vqrt096g1sbipo520protjj/36706742521.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135dab766000---vogota.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ede604ee38---90960306546.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/59886423927.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/98499297662.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/54243706073.pdfIn PDF document text

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