Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36e2da46d13357a…

MALICIOUS

PDF

87.6 KB Created: 2021-08-12 23:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9ab5793c3e83086f369aab4b185c0fc5 SHA-1: 9a98e849871965b07fd3c759442518d37abeade7 SHA-256: f36e2da46d13357ab92658f8c31df651716c97e92694a2e89653a14d46320659
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised WordPress sites, suggesting it functions as a link farm. The presence of 'utm_term' in one URL indicates a potential phishing or SEO manipulation tactic to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pixomot.ru/uplcv?utm_term=how+to+install+garry%27s+mod+gameplay+for+free PDF link annotation
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c51cd5b8911---43153411181.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/vemujumiliwajirumekekon.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/8kj2d02m6gvvscm7gfgvksbiv1/gajoloredukasapudapisita.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/fobidufatemuroz.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc32bec8aa4---63144995950.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/28027578336.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/94894863992.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/45802155306.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/lozimipowe.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/xunilixadipibuvisejora.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/pnqmnrkqojmlvkdbnqmgkbnis3/jogogikodi.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf6c108ef7---40216614861.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/jifififexoxel.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/20792701105.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/29799765377.pdfIn PDF document text
    • https://yellowstonewildlife.com/xifasojudogujixedeja.pdfIn PDF document text
    • http://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/73597963409.pdfIn PDF document text
    • http://uhli-janmaria.cz/userfiles/file/tipokasiwosafagozewa.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/4893106317.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd6b2813eb---25061276902.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd7fbe7d231---lunudew.pdfIn PDF document text
    • https://equinox-e.com/upload/files/11899281899.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/98208092687.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_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 11068 bytes
SHA-256: a62ec409f92a4c23933c7eb58bb513c07cc7e44707296451288d0be6235ffc4d
font_01_sfnt_off00010b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001234b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234B 17276 bytes
SHA-256: ea8c82d2aa44fa6ce197e7a97de6704180f587e46b965203215a6a4946684c6b

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