Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da8cc26d794a358…

MALICIOUS

PDF

77.2 KB Created: 2021-07-06 23:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 621e15f07947ac3212a5d8aec76f7d5f SHA-1: 7cdcd99bd409b8c41f4cad8b642c4d87fda8c931 SHA-256: 9da8cc26d794a3585d8cde91ee7ec00c2eb2ae786f3419bbf619706ff4cff702
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to compromised WordPress sites and other domains, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://krisoc.ru/uplcv?utm_term=letter+c+tracing+printable PDF link annotation
    • http://szpital-sulecin.pl/images/fckfiles/file/sinope.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b97c71a8e2e---sipovekokixada.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609956ab0f540---vogiwuvugebu.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/462917c514c4fabed874aa62eaa3de2e/15737021810.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/87608381142.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c939b50e6739597e8fc9daf8bc2feaa4/binakodifaduferivava.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a781e8e260f---60152050886.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/71eef0ae8a2f3a5b953873ffdf576b84/xuvijutedajudani.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/328924663cb88afc707c0a9d22afd5cd/87211346506.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711b6b5e168---69855699740.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/46579217410.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/45111774387.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/sananuso.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/13002959203.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/fanaxaponageve.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afc3f34df3---wumabavagemut.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/xuwiz.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b23b63b426b---bigosatopasesipedife.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/26921193918.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160850d36b5817---suridapesutakadetifitif.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4636035faf---sefimev.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/dor316catejb7g59p1f88b215c/jubilukixigusisezi.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/1008395247.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_off0000c974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC974 10360 bytes
SHA-256: f747ee5059522e6c020d5278f620dbc53f9e3deb514eef002759db6699be9676
font_01_sfnt_off0000e0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 17216 bytes
SHA-256: 13f19fd4a50515ed83b7b489563c53cc3adf745930ac085cc2d8480a1726de02

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