Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88bce9351538afe…

MALICIOUS

PDF

92.6 KB Created: 2021-07-01 14:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 97613e5d629d2305460e2ada0a5c0b16 SHA-1: 7aabc7082005c7cd9ebb367573f3fb867f5ac272 SHA-256: c88bce9351538afe2b7abda71fe19f9696aa806400ed2e348942b101852fe7b0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous extracted URLs point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The file's structure and the nature of the URLs indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=diocese+in+a+sentence PDF link annotation
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d09776cf7---94361749700.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/d07f8ebbd4fbbb26104843ae1c953955/polimadix.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b4a080bea0f927e460d868573857f673/55918773803.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/pialte6u4qmjor4i57a3dkf7ne/risulijubavumuwaruda.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/nigunopojokediwo.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/98502105718.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/86994641098.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/13be8debbcae101eb2e3c932f82ac97c/xezozo.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8591a6ff---8585410997.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/39479782226.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/5af792a5c268cc139f0c06edc24e0618/46893233770.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b14f74a88d6665d78ffe938e1548dd1a/newov.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/nudadajusebemomixo.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/oagq6pdobli0pb82a5qlrdphi4/lonugapixiveferuxoxe.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/a1130c55ef857ee659d3d0267e1d9ae0/89590667951.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/673c4be99b2ed0ff00ae9588254b9d66/1307609003.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba1cc8a09c---75684452509.pdfIn PDF document text
    • http://sciattella.net/images/file/27018484392.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/a3be7281aeb9092a16563e67663c3194/bogokodexarano.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/65476431995.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/24ecc1fe94222d6487e579703c969810/siwikuza.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/gefiropawupetorarelipubaj.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/32126361762.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/15769008497.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9f4f2cad---44897490406.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_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED7 10076 bytes
SHA-256: 441179df0fcdad67877b9dbf87e7d61bf189d4187aa15d67c80cf81920cdbc75
font_02_sfnt_off0001356b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356B 18012 bytes
SHA-256: 7570d43365c265aa156e31e39dfcca8fb5152e86f6b1e8103bab259c89181d03

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