Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c52e6a81cca31c…

MALICIOUS

PDF

97.8 KB Created: 2021-06-29 14:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: c977236d7285cd5cc5df7d7fcda4cc71 SHA-1: d83b0606e475bfb23178304749f06ffeae1a6b44 SHA-256: 84c52e6a81cca31c6aa0788476d8ae70e8ab15381e2fc1b2266fb720e7f32c63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a pattern of distributing malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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=excel+increment+cell+value+by+1+formula PDF link annotation
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b786076d8---wapasedufogesab.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/pinasadiwepek.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5ac37db32aa6faa0d79c2b437f93abbb/berukewixeruroridan.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8c11dbae253bf32e72449e0881c599f5/66534869295.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/91192273315.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/88612104012.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/14235407031.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/pokim.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/15e34ee473ee65c19af7982f018ef1b7/wepuwug.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pmvh2vg6hb2mmasvqjohl02peh/wibimewox.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4fe43d293---juxivuxigukegutuziwofemu.pdfIn PDF document text
    • http://splogservice.ru/content/file/42755513742.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/35326055864.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/zufebojomuxokinazunorub.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/pgoc0dttivsg50c3n38fvqj2ea/3415787209.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607547fe90292---20453951346.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/34ae165ad52d0c2c86d22669a3c12ca9/donudigosazezu.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/i9slfbfllo0vojspp0vvsnrva2/bumakuxadobipusakanawijes.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9e4c4ee8db9645cc955f7a951562251a/lozivuz.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608719fe74266---3709812970.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/fe65966e2e0077c8dfae75c6a1d4af5e/77405465179.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/elde83caf6gl31up0fe3q69jpo/gavuvolatiperim.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7780f2072---83946725250.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_off00011871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13088 10888 bytes
SHA-256: 3727569f885771ec6c62f40a8fdf809161e63f371dffcf7c08e77ce47b696ba6
font_02_sfnt_off000149cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149CC 18484 bytes
SHA-256: 778b584def63c5301816ba0ffd494da552a6a3115ad3a8ab8365330eb350856f

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