Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25d361599d6a2e8…

MALICIOUS

PDF

89.8 KB Created: 2021-07-01 00:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 96a90e013fbd47fd030d539028f82e9b SHA-1: 8344278d88f6c1439b789039580b1ed50ad5f8b2 SHA-256: f25d361599d6a2e8c32ec2fd70d89168dbed093e988c523c85f3d7c9a436fca8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or SEO poisoning. No scripts were extracted, but the presence of numerous external URIs suggests the primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=arithmetic+sequence+calculator PDF link annotation
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/47973f4985460d7ab4adaccd0f917f8f/918625637.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/obocmt4m5tbaopj1n8p03ju3q8/81604858331.pdfIn PDF document text
    • https://stopserv.ru/files/file/10166782513.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b840be6e7f---bisivodunaroxibewajud.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/17cee78a24282fd7c51208ddd0434c36/vufovanuwuzadigi.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e4de9517e5d575c6f7c19c8e6928e261/mojakubibegesuk.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0adba571c---bazugozegexasabajivixitu.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/789d3bc24c715a200d637942feb16c43/70551031861.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/4gp13dol38tibrj5fvqs1kpnm5/kuzobuk.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/864f1ca930b6f768a39c0e4a58d6d8b7/43388043526.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/nofegivipotume.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/60308438666.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/55f9235b294c2ad94081efd82540b5fc/25611885724.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a09e148e2fc---82941089618.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/26375607024.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/65265941183.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3c954f65---wuxifowekit.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/4sae98v93oa72skme6a69m3d32/xuxafoki.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/jezamosekunigazobuv.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/wunifefexisufuzib.pdfIn PDF document text
    • http://ruihuitax.com/files/file/luxux.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb5d5d301---36018376776.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/a4e6ff130733c0ddf7ab61c7ca245bdf/28090704052.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/10015070526094bc6e45914.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_off0000f899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B0 10720 bytes
SHA-256: 61c17674c3b4d52de075f3b113d107a6604c3ccb4223295db4e48222ba0f6711
font_02_sfnt_off00012928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12928 18428 bytes
SHA-256: 8c24688065e79ca5c664fadfd1bd6e857fe5a934899bfbc23420e05954932cce

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