Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec067ddebf4ecb0…

MALICIOUS

PDF

66.7 KB Created: 2021-05-22 03:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfb879ce1c7095714c1679c8ae115f2d SHA-1: ef020d0dca821d3369d275252ea35a2e04d45e78 SHA-256: 2ec067ddebf4ecb0cb7f062680b724d93560bdf1ad51787f9aa2167dbc28f130
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document is designed as a link farm, using SEO poisoning to appear as a free workshop manual download for a Mercedes Vito. It contains numerous links pointing to compromised WordPress sites and disposable hosting, likely serving as a distribution point for malicious payloads. The ML classifier strongly indicated maliciousness, supporting the assessment of a downloader or droppper attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9776

Heuristics 4

  • 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
  • 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://archism.ru/uplcv?utm_term=mercedes+vito+w638+workshop+manual+free+download
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6429d7984c---78259136070.pdf
    • http://billedbutikken.dk/articlefiles/file/xebosofexusado.pdf
    • http://anhbanglaw.com/userfiles/file/duxidadowazuj.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/28lrcq2u5pr3ttkap9nt551rsq/gekuresigad.pdf
    • http://renovator.cz/files/file/10431933546.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ak08kohm3c27p47a91db761c6r/52362751675.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607005d71df50---3268293712.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/4c938bfd1350cb3380bf5a12e112eba5/75054075003.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/masukoxopapusozagusi.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609f32a02f49a---zobabifoka.pdf
    • http://dansecyr.ca/pdf/file/wusesetigitevexo.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/84f0b85d3c3b177a8570bc8ec58cfd74/kirarekojotiwusakojebitu.pdf
    • http://vasvaripalmuzeum.hu/upload/file/43975307432.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-20/20210520022948462430.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160751aae9d376---19840768228.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5c4331159eb3817218ab878f36a9f392/75488871223.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e85c75992---kuzaluxawisolipinik.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/rj5vd6thqqda6kuf1bjcia0p72/renademuxebom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb2b.bin
ad1d4109b3d032bd53f04c75e805ac29022c64ab80996e15ca2677f43e7e4b3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 6128 bytes

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