Malicious PDF — malware analysis report

Static analysis result for SHA-256 601a1cf6a9b8de12…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 21:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c1b4c0928cead07896e454ee96d11b9 SHA-1: 3ff7f9f57f060d82b2f38d384cf530a3e68a8384 SHA-256: 601a1cf6a9b8de1236543ba0ff8b0afa39bb0de88738ebe9456200edd0a43871
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO spamming operation. ClamAV detected it as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and compromised CMS uploads indicates a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db817b4894e---rovibijik.pdf
    • https://solidpractise.com/files/userfiles/file/59211216564.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/5cd1d03abb6acc350ef19732d7ce0828/93783810137.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2213d5db0a---22882987165.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cda0fc48d68---39933604048.pdf
    • http://theemasternetworker.com/ckfinder/userfiles/files/69743214237.pdf
    • http://www.tobywells.org/media/fckdir/file/75014339291.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16070650de8638---44831450250.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f20e7baec9---64189339038.pdf
    • https://biothiennam.com/media/ftp/file/muzazefakevitukiwotu.pdf
    • http://www.electricman.in/demo/frontend/web/uploads/files/51720903951.pdf
    • https://vegas-shop.net/uploads/files/45241769070.pdf
    • https://kund-in.com/userfiles/file/40799553076.pdf
    • https://penmypoem.com/new/admin/uploadfiles/file/sowaruxevus.pdf
    • http://www.siposferenc.hu/html/favutewapuzifarere.pdf
    • https://ntct-dz.com/ckfinder/userfiles/files/22956443896.pdf
    • https://mariellatriolo.it/public/file/89758614937.pdf
    • http://dioblina.eu/userfiles/file/munudebavobejel.pdf
    • http://austintownfitch1980.com/clients/879833/File/pizetagunakalipalawudofo.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5ba4b71e2---40455603680.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff41f5771a---2913969822.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f454b308c02509d4f01ae1cad1219d1e/86617256544.pdf
    • https://go2germany.ru/files/file/ratapivesufegumo.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609dda1783bca---wopogixovakonuduzadi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=value+added+products+of+rice+pdf
    • 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_off0000dbe2.bin
160e5b4e4059ea48a929af2962bb21fed065b4c4236f350ce3cb6f6c6bbf506b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE2 17360 bytes
font_01_sfnt_off0001088a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1088A 16792 bytes
font_02_sfnt_off000120a1.bin
4bd294b1d1fa6f921c5398bc91de7465423e09aa6646b4caa35b536297a3e5c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120A1 10580 bytes