Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fc6590efa37bda…

MALICIOUS

PDF

83.0 KB Created: 2021-07-02 21:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce8735cf928f607966d1d1250887c2e2 SHA-1: 29c61834f4bff5223d61b50f945018e805b083ac SHA-256: f5fc6590efa37bdaf9ba75b9a997a3b9a7d235be6c011c442aa600495db1ab30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various PDF files hosted on compromised CMS websites, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6b58b120abd13cbffe151a6613b3a1df/67288139101.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a141f3690ac3727fac01c2c087877b4b/93909701753.pdf
    • http://buergerforum-tirol.at/file/nowujutidinawajetibabamoz.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/jgeas0lgbmr9n4vtjhllcfo7lm/xopivigepalorulopifivope.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fcb1b6ce3---mosukedunulujabev.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e39267eb1---76967697984.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/56ad28c3b159311ec6d3cd515206f734/53328143065.pdf
    • http://www.kickcommerce.com/userfiles/file/90038822823.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df2621c96e---14795637508.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b2a8c7a1e55cf17d20c261dfc5acc08f/retogedulesowebife.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/fb5bb8ade577beb42301347a8a9a3669/nalonegize.pdf
    • http://artetendasud.it/userfiles/files/zederudipog.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/7c69ecaf1f3dc70c3306de2b7db1ff47/96751869834.pdf
    • http://zulassungsservice4you.de/bilder/file/23554494167.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/fab79e5ed5429de132019c311a14081a/kekekebavikeviwavuvusup.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cb14012a857---zuvinup.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/6d450ab4fa816f4e1384a68b6e771c30/94834421065.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/a7050dbd27d70803bbe5e4e225ec538d/jowavegovoni.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160772bf38b680---kimebujawag.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/495bunbq2ui9jtpropjhgtajdq/17606220116.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/903360e838c4384598a72bda042cf234/12000500130.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f90ecfb3---15755449198.pdf
    • http://strap.sk/uploads/files/15743030980.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8de3b6790---kisovurevabufow.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=special+notice+for+removal+of+auditor
    • 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_off0000e25d.bin
b46923d2152ffc29a13baab38168e311ff0e3a90c4aa9892203f7ebe7c316798
pdf-font-stream PDF embedded font (sfnt) at offset 0xE25D 10856 bytes
font_01_sfnt_off0000fb6b.bin
cdac8c08fe18d7b4a5de1a65de3ffa3ca55c5a50080e801eb9eee1b7a3489139
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 16648 bytes
font_02_sfnt_off00012674.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 16792 bytes