Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f803875dd9a6d8…

MALICIOUS

PDF

88.0 KB Created: 2021-08-13 10:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f4382154ae69bf777f47fa1373bb0be SHA-1: 13185745410404a0fde2884428977b5e2bf45549 SHA-256: f4f803875dd9a6d81ae759967e1b1bd670044736d0de39407ae9289573dd2f4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate a likely intent to lead users to malicious sites, potentially for credential harvesting or further malware delivery.

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 http://rhondachem.com/d/files/45854986100.pdf In PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/44fdf5053d8b926aedec55e267cd6b2b/14586857403.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/23654062710.pdfIn PDF document text
    • http://bowenworktimmins.com/clients/e/ed/ed750a77e36579213b976c45729ba45c/File/23488579614.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b21b3037cbb---97852856747.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97d8dc8f6---68038335573.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c695743ff1---64535710929.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/92138849627.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/90216f7d5c59389e00cac58f0b256f13/17788635288.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/kotopoduvusewi.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607363e2082b7---jepiwowinuzovenegilosav.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acd0f29a20f---vibuzuzoxigeki.pdfIn PDF document text
    • https://ms02bet.com/contents//files/vekefilibirebisewakerabor.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/mikarutomasejiporomur.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/medikitita.pdfIn PDF document text
    • http://skupka23.ru/upload/m/38587594421.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/57275902976.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/33077378412.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/64806459655.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/66059095431.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ceefd6a64---wilepibe.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/8438142804.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/4f41d25434e9b785df196f30f40b7af5/zijenatebu.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725c33766e4---65455891223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ford+4630+tractor+owner%27s+manualPDF link annotation
    • 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_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 17172 bytes
SHA-256: f00c12dabd728934e6292c103a1a8cdded53b425be8c59e4c930ec2e781b258f
font_02_sfnt_off000137d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D6 11176 bytes
SHA-256: f681b219ef36033d01df4617147fee2bd01dd55c5109d544cbf18ce5a53cbc8b