Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a58921dce81da2…

MALICIOUS

PDF

40.1 KB Created: 2021-06-24 20:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1e05db7c151a9fdd642e96029a1a8c55 SHA-1: 9252a9495ab633d228da3311851719e0d3445e7e SHA-256: a9a58921dce81da212051ba91357394d1252bbb5c35c01fce7033080988eb149
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as a phishing lure, likely designed to trick users into clicking on embedded links. The heuristics indicate it's an image-only document with a click-outward action, a common tactic for phishing. Multiple URLs were extracted, many pointing to compromised CMS upload directories, suggesting a distribution network for malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8386

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://medvor.ru/uplcv?utm_term=mesh+to+micron+conversion+chart+pdf PDF link annotation
    • http://sjhrz.com/images/upload/File/96906102398.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/xowikimegijagevujuzeva.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/tapitiru.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b4c4893ee---nefenegigamudoki.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c54204bcdde---64961252923.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/46e8a8b3cc74e8b00e76aeedd89f8d8b/nuzilufesi.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/mubiji.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-6/20210606114233667753.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/6nt1mogkrogf4arerl3i6rct81/61576627207.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/fc3eb178227add4b2825e06c54b50cda/vizisosoxukaneje.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/bijajibizokibobogesigafo.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c611b3c228b---zudixudibujaf.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/xamamarawigupuvenez.pdfIn PDF document text
    • http://talleresjpg.es/img/file/tipilimatovupid.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/lpij2q7v3fufh5qc43npc7uuo7/sawame.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/79267392786.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607e47ae10f9c---gukafonifusames.pdfIn PDF document text

Related samples 8

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