Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5bad42c7ff6d94…

MALICIOUS

PDF

90.4 KB Created: 2021-08-10 11:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: edff507bb376f49a373295205a115118 SHA-1: e76c830bf8755741315fa13b440440d44851e9a4 SHA-256: cf5bad42c7ff6d948cb841db9ff53abd0a521ebc2491934c1466a084bc6cb86c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the nature of the heuristics indicate the file's primary purpose is to direct users to malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=iupac+nomenclature+of+organic+compounds PDF link annotation
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55c1d968c0---wivekafot.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/givakolexugijixabepo.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/8c691c49ef13f2e08405a1d5d12f4d17/2343401890.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/gokobimejo.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/f0p4vcjknm122tcdfts4gh7qr7/83454602898.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/81942684486.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/luzifavanifobopijit.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/kagodevutoja.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ea9b82210---28780417219.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b9acosffq5no5riggh7h3tpgg/67313474703.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8293a85450---86327985388.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/65bfb1b56358a5fcc635d6ee9613c56b/30483436313.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b32bfa52c183c00e2c872befc2bcb275/48486696611.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/gm3fim8htph9bba2tgb8o2aalb/63903585131.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b4acfec7693---fozidodozemodaw.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/wuridelamanaki.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/taxizarowat.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/pelexudorid.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/25035958808.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608eec3f7af0a---pewelirefufogukewofumuxu.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607126fa7906b---xebigu.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/950ad0c9689c632d10fcd9d350ab758a/41764954754.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/cqr5bb1a0fi2h5n3i2ae1dsodd/sadovivezuwogogakud.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_off0000feb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 16760 bytes
SHA-256: 2e4283d4fa4036a32133127199a7ec25b2b7d57645e636e216e0407b8bb194b8
font_01_sfnt_off00012a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A79 11012 bytes
SHA-256: 0b612369a95b8aa6c3d518d6c46ad92d7df49f3110d3f1d92d4ade6154a3b972
font_02_sfnt_off000143da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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