Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0bd5cafcc34071…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 06:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a7a5b07d7624a116efa33b40216e768 SHA-1: 9bf2d562be433159e8194cfeca0fe29583c8b77f SHA-256: ca0bd5cafcc340710da58a7ba808846f1678f7c53b1d50bc968f84826118601d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The primary function appears to be directing users to external sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=methods+of+teaching+grammar+pdf PDF link annotation
    • https://educationindiajournal.org/ckfinder/userfiles/files/wofidubako.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/87815631343.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/tatelawivituzalawusat.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/0d8367b08ac053947987814da38da21d/putaroninulenikifetusoz.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/24882892463.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16097ccfd1d25b---fexevodobe.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/jalavilamukib.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/42411201636.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73df2568f5---gifetifin.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/32704691717.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/089cd9bebbac80dda4fb835e1f96e1dc/12212723239.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/51783687082.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/iffq9qd13fssvk575mpa2n31mv/52656484880.pdfIn PDF document text
    • http://honghuibio.com/d/files/6114013530.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202108141637022833.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/pexenefutasuwalawolitenab.pdfIn PDF document text
    • http://www.bash.cl/media/file/pudawid.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/4fd9dac68f2de0e67d78937aa5e36204/nevugelaga.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b528785554---74815722016.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160761a0f2383d---sifipexuturosasosasogifal.pdfIn PDF document text
    • http://kingnature.ru/files/files/rowore.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5f0b695eb---zilolewalilizuwa.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/momexusodazorijakikek.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 18044 bytes
SHA-256: 4c236d2db5a50482659814a73469ecdbbdc87cc778d719e408c8748e1773795a
font_01_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 11016 bytes
SHA-256: 23faebe52b93e8386814100e263e201372b636b583942e34b0638922c1ee19f4
font_02_sfnt_off00012112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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