Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af5e02ddadddf64…

MALICIOUS

PDF

106.2 KB Created: 2021-06-08 13:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f65bd19ea157d18ff0240cdee9b2e987 SHA-1: 55427f9f13db87d08af3c5ae4e7e7d4ef78e0c06 SHA-256: 8af5e02ddadddf646ca520206a64352847e36add01066c7c45ae530e608d8056
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to sites hosting malware or phishing content. Although no scripts were explicitly extracted, the presence of external links and the high confidence verdict point towards a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://infrive.ru/uplcv?utm_term=periodic+table+of+elements+list+with+protons+neutrons+and+electrons PDF link annotation
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/922bdcf2d5bbc29e28c334b08978c500/2170032033.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e85e42548ff4acd12f93f76bbcf4688b/ruzozo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608441a802d45---42850518018.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/4fbietqa0mu8pfi0btp3sbsqgd/kezekuvawefidavovumig.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/dmfp7bgg1hjue5clhncrol8gb6/89413446348.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608137c8b9d3b---86930603019.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/62402233223.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/42056085824.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/denujolotabapinodaluwiwas.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/dobagovetabugo.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ac16831e0---xemimibegeropexu.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/gulolipolezibu.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/nigux.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ovm12mcmbfn7ll8qeofbo1nfs1/20151233758.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/nexop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F66 5628 bytes
SHA-256: b2f0c80db5a42ee1184eafb82164aebdb6ec47e0eeebeb9166d7afb6b7555f54
font_01_sfnt_off0001726b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1726B 11748 bytes
SHA-256: a7e96d1bf2f69c447edb6ee6ba32e2e091dd10c438deae6d274f18230c37b5c4