Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea3951599e05100…

MALICIOUS

PDF

77.4 KB Created: 2021-05-25 04:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b0af74eb782e3762372cb31c2b96cb4 SHA-1: 74189326ad8a22026cea84e18d064ea444f577f7 SHA-256: fea3951599e051000ecf37fac670a86fcd90c0b1c64b3b0a7852eba89c70742e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a game. The ML classifier strongly indicated maliciousness, and the structure suggests a lure for potentially malicious downloads. No scripts were extracted, but the PDF's structure and embedded URLs are indicative of a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c5cf9662a---94101249563.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/mhdmugpcgk4dio16fs9pbbkel8/61342932311.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/2vu4lnjmej39r6mbfvpmitc7tb/pimujuw.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/a124a4d0a075e8b7e86cd6e88522f776/94895926074.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/56bbd329f11917ff698e35d05804fc28/20177979586.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa163be22---96950544390.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609652beb3ee5---14977846303.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609830825970e---48616333010.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/79092428424dba9bd70cf4050fbf757d/24470554137.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbf430a371---fabadefeziz.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea259214de---viwelowigu.pdf
    • http://anandtouristcorporation.com/uploads/76146369551.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16093fcdf125e3---39034343552.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a107a0e527b---52164052794.pdf
    • https://tolgyesvolgy.hu/userfiles/file/zofusaranutop.pdf
    • https://sonarmusic.hu/up_image/file/8853001802.pdf
    • http://gabortech.comadmin/file/nelol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=subway+surfers+game+free+download+for+pc+windows+10+offline
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed90.bin
ae5e60c0634d2acbdcbd43c747721f77f2f52ac3022cbc47acec943e790ae2e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 6104 bytes
font_01_sfnt_off00010262.bin
7e1bac0f6340e383b247c1b9ad0f074c681c6a51d557f1fd5bb4d99f71c962f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 11320 bytes

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