Malicious PDF — malware analysis report

Static analysis result for SHA-256 a266051486d34094…

MALICIOUS

PDF

72.3 KB Created: 2021-09-03 00:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94057d848ea86cbf8ba876c12ca48620 SHA-1: 1b20f9b26a153f6da7ee331f332f7ab9831eb42e SHA-256: a266051486d34094f5a0b1accc6227e9262de384648530f437877470330f6112
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised or disposable domains, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=possessive+adjective+exercise+pdf PDF link annotation
    • http://abnicum.com/files/file/powifogepirimawenif.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b759c11ffee---rodudanu.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160e1862d5acf8---9683199424.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/gomijebijudaneliven.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/nidijewoxiwurelabib.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f135411b47---pafofaxigegoxusafofulawu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f872aaf402---48371940812.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/16919021588.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/91121132001.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/zugadefigopibovurilikem.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a43c82ef0a5---39816752431.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/94751353951.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3607a8c4a---famufabaxowulujanofoxonu.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/93159ecd6eaab102371c60325c9cdca0/dudijep.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5727982e967e16db887c708917f7841c/fikafufubidimus.pdfIn PDF document text
    • http://sciattella.net/images/file/92894964506.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/95577337733.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/12719352481.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/desotunawologodamut.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d8f954f191d82ea7a5e3fb63b18f339e/senagonadamobusi.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c746967fdfa---waxejavewa.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/10908226065.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/41240373873.pdfIn PDF document text
    • https://egca.fr/userfiles/file/lanowivalul.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_off0000b822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD039 10760 bytes
SHA-256: a94bee40fbc948e6bc5b7f494aaba0aaa6ffd745dcef760c1421861b8cf012de
font_02_sfnt_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 16688 bytes
SHA-256: a3c0acf7fe85205f1effe926274c1cf7ed405e54344371319099f924185f2ba2

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