Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7af8c6ef8c4f8d…

MALICIOUS

PDF

73.9 KB Created: 2021-09-28 12:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0235c4973aeda6d4a82c14e46f4ae438 SHA-1: 763c60757319d5281c565153be7db0396f76e8e6 SHA-256: 0f7af8c6ef8c4f8d949d06cb7ff5c321a4eb55f139445a59558a83af9d49c70b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://smidgel.ru/uplcv?utm_term=new+english+file+a1+pdf PDF link annotation
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bf062d135---zogetitawovisovabux.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/mopoxin.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/xogigikoga.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ea4b3428a3bb5fa745e6627f61186985/vamupapiwi.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/nadasutejixusud.pdfIn PDF document text
    • http://canadianrockies.info/files/file/gojifedidazotubu.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/zuwugomaruruxetuki.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5c55f2e5c---tikebad.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/33393587964.pdfIn PDF document text
    • https://andana.us/files/files/fanovenenir.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/pitofemijakuguderuz.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/nogasowisesogizamuve.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/movevare.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD013 19784 bytes
SHA-256: bb3c84fe61f9ad827cf3fe78a28a7b1d56b20068dc729dadac41f6911c3b037c
font_02_sfnt_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 10576 bytes
SHA-256: 8c585967991a6225d3bb77fc5760e237be2ef6b77a07d3b2bb14835f694c14fb

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