Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a267a49da9d8c38…

MALICIOUS

PDF

67.8 KB Created: 2021-08-06 15:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5fed614a4c8560d5e4fee7aa2ea3381f SHA-1: bde6f6614230186e54a063a0ba4c800005ff3714 SHA-256: 1a267a49da9d8c3855335203bf9f1ebf18ea2e93fadddd860be7ced39bf509af
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV/ML detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6374

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
  • 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 http://niengrangchuyensau.com/upload/contentFile/file/tazaxezopuxiraxu.pdf In PDF document text
    • http://schodylux.pl/userfiles/file/33003438132.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/146e72f6339f6acf342e6469ade4b327/88380111465.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/42130673086.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a411960782f---nawupazo.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dc729db00---wemefatiliditasex.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/11962222848.pdfIn PDF document text
    • http://altinay-law.com/images/file/pewukerav.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/d211bc00b687b872bf9812d94ac046fb/83786668864.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caf94651189---68273877791.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/sixufifiditagogegovik.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/wakubob.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/59221765550.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/subomatiwe.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/fukezujenejapan.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/77454304255.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3993b5c1e9---5878693083.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/62080579386.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/3299429279b1d42e0e4ba54fbfb041e3/52348533855.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3aecbca0e---84067298284.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/wiruz.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/4359265289.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/33879801122.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/d4f6f9d6c7ce2a97f826e04d1ff0f85e/26879217940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=what+time+is+formula+1+qualifying+on+channel+4+todayPDF link annotation

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