Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbda0ec8dbb633e…

MALICIOUS

PDF

78.5 KB Created: 2021-07-10 01:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06919ceaea8f60086537709c05c226de SHA-1: df0e8f856428d4fef3bef597471a9b8d6ee97b91 SHA-256: fcbda0ec8dbb633e71d547041091249a78b0eb8d2a72fd366544be2ede30dadc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of multiple links and the use of disposable hosting suggest an effort to obscure the ultimate destination or to spread malicious content across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://northmarking.com/userfiles/files/40574340133.pdf
    • http://smartwealthhk.com/userfiles/69728430444.pdf
    • http://st-johnson.com/Uploadfiles/files/6671128919.pdf
    • http://hrdiborice.cz/erucom1/files/files/kerikuripisifikuw.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/ea558e36cabde2e6fcff33a34d2868f5/lejabekibukorad.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/d1f25e779652f57aa5fe0a09334e495e/15777872464.pdf
    • http://cokhiminhhien.com/media/ftp/file/31424845750.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf16855e6a0---76907045951.pdf
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/rinokerolis.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/13702599371.pdf
    • http://ciaooo.ru/uploades/userfiles/file/37254295848.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708a2977294---10038070149.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/2v5c48f35v8opclrdqhfsul4e7/godazujum.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/02277e3638cb8ef8342c484304631d88/57222029686.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/apgunm3ujqsgvr6c84tmoj8ju7/90989283207.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160782371d16ff---tigumekimofitaz.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b16569886d6---xefoxoteke.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d532ac2fa29---mujawedatitaxatopakabeju.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3383f95f98---zakot.pdf
    • http://grgct.com/ckfinder/userfiles/files/jodexumatesiwanoguludose.pdf
    • http://amandatravel.com/userfiles/file/98555011998.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b024796fe26---rovesavavunilefajine.pdf
    • http://marinapogon.pl/upload/file/12931938743.pdf
    • http://vtvxm.vn/userfiles/file/rivutimunur.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/80dc9a7acebee4029d7f43a3255147b4/8669482758.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=regurgitation+meaning+in+english
    • 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_off0000ccdb.bin
b2ad91604961e5b4ca83a8dba5486f81071d2f93b3d1e05534f034b422e092e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDB 18136 bytes
font_01_sfnt_off0000fc4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 16792 bytes
font_02_sfnt_off00011461.bin
9b404416db637cc1010847c13493d9bb5b8613f0bcd894bc21fdf3eefa9b9553
pdf-font-stream PDF embedded font (sfnt) at offset 0x11461 10700 bytes