Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab552b4c282dca5…

MALICIOUS

PDF

85.5 KB Created: 2021-07-10 04:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a5241762fdffd0ed79ac8d66ee96ba9 SHA-1: 11d33ce7d42478ee62316dd4a614dc3e46e0547d SHA-256: bab552b4c282dca5193abb0d39cc5db331c51b39df39af8aae4f424fe3b0fc02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress sites. These links likely serve as lures to redirect users to malicious content or phishing sites, a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16091fd993ed86---gumalofaju.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/o9lguupopkm79u7mnofvoanl4d/29072044754.pdf
    • http://www.awakohchang.com/image/upload/File/8797639964.pdf
    • https://bloomeng.com/uploads/29489733929.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a51b69ed2e---wewekitamaxajo.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2352ef110---lipumazufux.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f683ec1104---dixutiliwarinabe.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5238d7401a---xaxujutakakedosali.pdf
    • https://alakharia.com/public_html/userfiles/file/23639539856.pdf
    • http://10glazsikeyrosa.ru/file/51288245318.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/1k20v7bo78dseerd37mpkpcn1l/28622688480.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e223aee49---wufifadenor.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb057b6601---41579323536.pdf
    • https://path.mn/userfiles/files/5005233329.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdf25dd4c7---22070642563.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/fb2b06b0076907f586a2891f8a9df50f/fazifavolawafogufe.pdf
    • http://mesterek.net/tmp/66623424772.pdf
    • http://zulassungsservice4you.de/bilder/file/86953832495.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/24ec8dc5ec5f582e350547232d035481/26426900889.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a32a83b26---suvelutevupibojosofezagow.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/xujokedixebopagupivoda.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d8455205b---sikipigarik.pdf
    • https://avgdesign.com/userfiles/file/83322939190.pdf
    • http://montri-inspection.com/naichabub.co.th/images/upload/userfiles/files/darepalefigadilemi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=free+coins+master+coin
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed3f.bin
ac7044fc4e33427ee4600c6a06e55e84ed92b08a81fd520acd8238ee633bec31
pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 10320 bytes
font_01_sfnt_off00010482.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 16792 bytes
font_02_sfnt_off00011c94.bin
48726ed23000bc32350e55ce6bf8e997f361d5d62342f586ce9f9310f1215f91
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 16880 bytes