Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3b05a57246bd6d…

MALICIOUS

PDF

78.7 KB Created: 2021-07-01 20:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9caccba7b7148343674f47453c320d9 SHA-1: da1c88f60643cad08b9780990c4e77b472b69b8a SHA-256: 5b3b05a57246bd6d5f8e77388ce9ecf995e30ed17abf81eff5d0fa5e9f7d2930
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing unwanted software or leading users to phishing sites. No scripts were extracted, but the PDF structure itself is used to host a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://oniceh.ru/uplcv?utm_term=download+proxifier+apk+for+android
    • http://asfalon.com/__files/file/pivusepejenebotefo.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/h1kiejs3rrfo4fcja3cejgd371/58770148481.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ea9a44e9c01f193d920cf8d56b2facca/71480555203.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/m4u2jjdm45bhesci4flmpe4tb0/93151767876.pdf
    • http://maasmartcity.com/userfiles/file/14861840774.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/0gt1c0cphnmdtdvkuq76245beb/tovepubigutufajegidali.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae838ae328---29348453410.pdf
    • http://unicorn-furnitures.com/d/files/bunobog.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/b4beefe87491cdd9e5cc8c0cc921a1ff/37650723184.pdf
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rumidoxenavigenalefum.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1370bc41e---45695698338.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/fe8b49b40cdf94e37951bb7f565e0314/41453525306.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/l5o5kgr19l601ksqh20o2jbv15/52412310559.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2212581ee---11964287716.pdf
    • http://grawerlik.pl/userfiles/file/83793800258.pdf
    • http://color-gateway.com/userfiles/file/binezobekemojarakofe.pdf
    • http://cnmrobotics.com/files/files/31638462049.pdf
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/kozimikonetimevuvalutarug.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bacb7a7a1---42673114388.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/0afa6b2f29ab4deeaebaab4eeb2812b2/64176715825.pdf
    • http://curry-box-deluxe.de/userfiles/file/91190808666.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/rt6cdjbag4gl6d6ga1sdmhm95f/88415074773.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083586aa56a2---jalifajutobetesu.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_off0000d1ac.bin
0b4e3797eeeb4e35ff5a7e8482aebf8a8cbe7b433a201da15f194b292453cfad
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AC 16832 bytes
font_01_sfnt_off0000fd9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 16792 bytes
font_02_sfnt_off000115b6.bin
095be6fb4ebb36aa2483398224a9743abfd2167e4835d07124aee8c837980999
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B6 10508 bytes