Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7dc20158cbc4d0…

MALICIOUS

PDF

40.7 KB Created: 2021-06-22 20:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1bd2515bd655eb716530ddd3104d8c1d SHA-1: 800055a7391ad93900411ce18ad2870a77febe6a SHA-256: 5b7dc20158cbc4d0fdc394f9136089c7593dae23fbdd6fc3056b1e35eb9ba4ab
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8166

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 40 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=circuit+theory+textbooks+pdf PDF link annotation
    • https://kvkumariajnkvv.org/singhania/downloads/file/gozipa.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/83954812073.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/warotujarawenukerikav.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/589f7f2a873d056a0fa5ff566a871573/45393524512.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7892d989d8---13726504139.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/n9d74r6aj5uvrvihv74kd2t3i6/16312439873.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/ketolusawonun.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074165476754---barexur.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16093a4b26cfaa---dusidabozumumujazofefu.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/402f821837f076989362ad622977e34d/29405856393.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/gunanenifavet.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/57483bfd8c09ba82c71d21e3811283d9/padesoboxir.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/84698bb08dc478c64a8bf65e70cb5c9d/zodigopavej.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-9/20210609231947440420.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/1a7953113a36bfa04e4d9ab9369aae9c/pezamakoxonitevoginudaw.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/5644584094.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/vatajufad.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c45ce8aae21---wuwafozonusonamufuluvulul.pdfIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

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