Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f3fbf689cdc33d…

MALICIOUS

PDF

77.0 KB Created: 2021-07-12 16:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0d466dffed1f9962a071addd654c3d4 SHA-1: ce56793e3d25d48eee1def282e1fb54aa8c80a3c SHA-256: f0f3fbf689cdc33d6ca116bcfb49ff5ae780cb2e3e8f7194ff87b1b597201215
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple URLs indicate an attempt to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ketchas.ru/uplcv?utm_term=document+cannot+be+printed
    • http://bearings-home.com/userfiles/file/depinizuferitisa.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/935011f35ff2cdd358b34b86b725f118/2722989603.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/84bc05537cf6d4b537d953789f862af6/98988478427.pdf
    • http://tajeer.co/userfiles/file/96977651550.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b691892dd3---84346959339.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30bff1fba2---24597210707.pdf
    • https://alquimia.in/admin/fckeditor/editorfile/xoxoxikiba.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084b46222aa9---liribawu.pdf
    • http://ekolojikweb.net/upld/userfiles/file/13729137215.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adaed655ece---xejixaxutox.pdf
    • http://aqcons.vn/upload/files/supit.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9483edca01---dejavodarafexejatebena.pdf
    • https://eviinstall.com/userfiles/files/ferebitawudokusaxixoduto.pdf
    • http://deepakbatteries.com/uploads/file/panumokasejafalajad.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160715d02a386e---tifojapowizokobedatojag.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767811774bf---51563152072.pdf
    • https://airtelco.com/data/users/_/email/files/14804202268.pdf
    • https://supermagnum-bg.com/userfiles/file/50089226350.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ac2f7ad240a7ce69186b3eaa7468912e/todozilotone.pdf
    • http://blissworldbeauty.com/newerac2c/userfiles/file/texizerizavuzubof.pdf
    • http://yaqeen-eg.com/userfiles/file/13653653431.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18ad710e45---47717787600.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcd82c6972---84522348858.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607924512060d---24381604670.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_off0000cb7c.bin
bab537cf8031a89751b8f1852002c5efeb140915641143719ec3c02fb8bb9113
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7C 16608 bytes
font_01_sfnt_off0000f68c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF68C 16792 bytes
font_02_sfnt_off00010ea3.bin
d77f8c848b9f32595a5f83ffd71aa7b49d9136bddcbc9d175c9b5844d7e5ff80
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA3 10704 bytes