Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0ef015f92f07ef…

MALICIOUS

PDF

94.3 KB Created: 2021-09-01 18:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e9dbebf27acfa29ba08e1f331f62e06 SHA-1: cdb6a8409dcf720e6ab81e29d0cbea66aa21b979 SHA-256: cb0ef015f92f07ef244e726e03039aa58eb94a58c175cb3b0f27688de935fa29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to external sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://benly-carson.com/product/files/pinonugi.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e29b667f7cc9f4738bfd824ef3e2d8ea/sisososexul.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d4835e5ce---14419389166.pdf
    • https://mattress-leader.com/media/lowutitunukulisisuduk.pdf
    • https://kund-in.com/userfiles/file/rebedu.pdf
    • https://vinadesigndanang.vn/uploads/image/files/35193096708.pdf
    • http://brianhaymore.com/images/e/file/nazuzudazazanun.pdf
    • http://turar-mussin.com/userfiles/File/67244102666.pdf
    • https://granitnet.hu/editor_up/59813626782.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f04c68e5bf---luladagivirabajewum.pdf
    • http://stavclearing.ru/upload/files/72181746196.pdf
    • https://gyn-koe70.de/obrazky/file/xodorim.pdf
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/53614128067.pdf
    • http://clubselectionvoyages.com/images/file/34162476520.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607784d31f73c---93822942017.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c498eb081---duluxilase.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/htdfpg1qi9m6k6gv6v8ne49rlm/81325926998.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ba9df892f580c983f78c33b1ec225212/21925459872.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/eb766c564ff43264268b62fb24c64760/gimibokekutodizarezaviti.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081921888fc8---ririritepib.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb039c2ae74---rinabese.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d039cb78977---jugut.pdf
    • https://binarbaid.com/public_html/userfiles/file/70391440222.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=best+editing+apps+for+videos+free
    • 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_off00010bb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 16792 bytes
font_01_sfnt_off000123c7.bin
b5c2d8b73f107b113ab8cc1d0095def34d950e9aa3f7516cd2cf75e0f1b722d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x123C7 10748 bytes
font_02_sfnt_off00013c76.bin
bb30e6f61eacf9dcd9dea6a635b7a8dfbf6cc959aa2daea020d8b82d57f07174
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C76 18172 bytes