Malicious PDF — malware analysis report

Static analysis result for SHA-256 9148d07fb55d1f6d…

MALICIOUS

PDF

89.0 KB Created: 2021-08-02 01:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5396b2579e0dee6ddf479dbdd4ecaf53 SHA-1: 5079e3aed3f800cdf88efabfe667ce0e904df5f5 SHA-256: 9148d07fb55d1f6da6fcead4349cb95940f981b6993d3f22ee2e5cd8dd644632
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=android+oyun+club+gta+san+andreas+%C3%BCcretsiz+indir
    • http://byty-pardubice.eu/UserFiles/File/3199118540.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bm3cqej6pl7dh47v4mn5c5sk0e/94364903675.pdf
    • http://koyomisushi.com/uploads/files/18808190895.pdf
    • http://gabortech.com/admin/file/zagolamidulidafuragamarik.pdf
    • http://teknis.it/userfiles/files/bomelofesudebu.pdf
    • http://uekekb.ru/!upload/files/30663865387.pdf
    • http://aybar-gallery.com/userfiles/files/94533863214.pdf
    • https://driftwoodcc.com/userfiles/files/16313888531.pdf
    • http://absigorta.com/E/file/80127344058.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/a6ac161bad5d6ee7e965bb6b67bff7b2/zerisor.pdf
    • http://jkbprivateiti.com/userfiles/file/kizoz.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161043afb79638---8102090672.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/d7881a33c59720ac55ece9ffa8354cf4/vuzifemonij.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3b5cea7538fb15e1990fa8f9c1165d77/66809545824.pdf
    • https://shellserva.nl/docs/Image/file/jezikefoxaxigawugufubu.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a742b5e0f---xikibumunufubovaborosib.pdf
    • https://nhaccugiare24h.com/uploads/userfiles/file/rapusetupesimi.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/76043169997.pdf
    • http://farmina.ru/uploads/files/79672136852.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/9iiscrheijlot1el47gioj68d9/17731170996.pdf
    • http://nuovojob.com/userfiles/files/ratajosivaridoz.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/efb6ec5e491096eb66e4445841935eb4/zefinajuma.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a573b88294c---74090878438.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vhf2goviu5v71m4scrp4q5ei42/dezulizuxapefeki.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ahpv1r6etgeilurote7mfovev3/jadawexipaxiwanogu.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_off0000f20f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 16792 bytes
font_01_sfnt_off00010a21.bin
f622f2ec41a5eb84b8dfbd1152b05ad532baff267468d8aaa5e1cdb44c3f94b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A21 19344 bytes
font_02_sfnt_off000139dd.bin
5c5a7dc5c1358d2ec48effe9f52d794ded70ef11689a68bc79199620a204d14d
pdf-font-stream PDF embedded font (sfnt) at offset 0x139DD 11132 bytes