Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2fd30824a28b7e…

MALICIOUS

PDF

73.3 KB Created: 2021-06-26 00:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92b8ceba489c8256dc6b8ca3f6f43d4a SHA-1: 33b2a7124db432e9e8a43e4051413e5beb51bfe4 SHA-256: 5f2fd30824a28b7eff9f7e2cc26378a65254e477ccffefce6b61ca46e82b8ca5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms and disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af6fa68a85c---70026988003.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f27ee1da8b---76140244535.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acc3046e92f---bukakedeliniz.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b1a936e1f---78615689441.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/n260vtnb2e43d164q95l4ievcv/wazitoniravazodenipedexi.pdf
    • http://writtenmail.com/upload_images/file/tiwutenivedokazona.pdf
    • http://sgd42.ru/userfiles/file/jorofoxobovobopipurevow.pdf
    • https://tusenfotingen.nu/anvandarbilder/108/files/40929487131.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/vf48l9jsqa381tb168ubfbbbvn/13346894673.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45525e02be---77997356768.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/3db2763287f3e439ff934100184f825d/dixogoxefibek.pdf
    • http://kibbkw.com/uploads/file/22901529933.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c67d6c2c1aa---77672262565.pdf
    • http://budohurtsa.pl/userfiles/file/lerifi.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/8rs0mto1qkjs32u6lbupfdhlgo/femazewiluzagiri.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8538dc23d5---13431530165.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69075f086---nuxixufipisikawewom.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a26520af467---lapet.pdf
    • http://laser-piskovani.cz/democms/userfiles/file/83018333238.pdf
    • http://burrburroughsfamily.com/clients/55468/File/kovurorukevopiti.pdf
    • http://arci-mp.fr/admin/File/vezavujexabifuwatulubige.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/qutae5cpt5aca9jg3a3m0f21gk/16675480420.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/vhv17hfvccg6j6m9nrs811oh9a/bopizelanularebivokonel.pdf
    • http://agcslohian.com/userfiles/file/buguwuguke.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=mental+health+and+therapy
    • 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_off0000c28e.bin
a6976b7fa25b8b7e2478d413d61b3bd962c6398677206e9ef191f9a030b9cb3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC28E 10216 bytes
font_01_sfnt_off0000d967.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 16792 bytes
font_02_sfnt_off0000f179.bin
242cd0ab3e7a497a1e8255545ff5ede70bd324213a779c135823c6b462f56a71
pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 15328 bytes