Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b47ea7c1640840…

MALICIOUS

PDF

74.7 KB Created: 2021-06-23 10:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 0a19f74b35d66587c344024bc0d40246 SHA-1: 698024e0e4b7ca2a9b9980d00079aeac9be5886f SHA-256: a6b47ea7c164084060ca2ff8b69d340f0a641197470f319db88d61b5e0c66f83
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://krisoc.ru/uplcv?utm_term=download+minecraft+16.200 PDF link annotation
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b2b40dcde---18273019411.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844f26296d8---masarivebofitotaxodatenuf.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/12f96225f47e472cd6acacc7d88e5d18/zesiniwed.pdfIn PDF document text
    • http://learningkey.org/userfiles/68422815616.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077a1a2c95a4---90791198432.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/2619902467.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/disogazibopowuwiwuw.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/06e0ed72f914600d2924c1b6e5cef68c/tubesoditipetafebovugut.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/93947957498.pdfIn PDF document text
    • http://web68s.com/upload/files/zovafenokuguvi.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/vpq6upho656mjv32gv71riahtd/zopuvopelojase.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088592eb76dc---34676516257.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ab14ba6b0---48882225662.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_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 5592 bytes
SHA-256: 1ce13c890bd28cbd2950229e97e22c27808e527d93d1574c3fc2c202cff4c078
font_01_sfnt_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 10620 bytes
SHA-256: 1c0dc3e7213a52e5d395f10142a0ee23e4948d867a340ce18a93956a4f99aa0f

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