Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9925cdc24653c46…

MALICIOUS

PDF

93.4 KB Created: 2021-06-29 07:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3ca53ca2c46b3003360c584a8de535b SHA-1: eae7b2259b2e851f8f25898983f761c29708be8f SHA-256: d9925cdc24653c4613f65d93a2d28df36533d6937d52456e4b6b3fb32279f808
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to compromised WordPress sites and other domains, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://inwebjor.ru/uplcv?utm_term=solemnity+of+the+assumption
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac05385b350---50067407792.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a049b26a4e26e8c1d1d5e69f9cf9b19f/wubinakorinisusezufaz.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/dl8147mt84jorhl9q59dkhclo7/42970998516.pdf
    • https://fedico.ca/upload/editor/file/80961477643.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f2d24842759d7367f59ebb38287bd48b/jesivijovufopun.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/9cb6f536dfc967e6a08cd7a0f04f6315/wagubolifepixilefoli.pdf
    • http://statewideroadservices.com/clients/879378/File/gokirobuwibojidil.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a0902caf178---956157578.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6fd7d637f---mipofobuketere.pdf
    • http://www.findvoters.com/userfiles/file/nifopulizezununovadexili.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3472a69baf---welazo.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/eb0a7c110e970c53170f6a4d842acace/zimezabesitemidoveredugo.pdf
    • http://coinproject.com/userfiles/image/file/nasezufapepeponu.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d50749dd91ff7d9674b8687fda0799cc/83807422755.pdf
    • http://kemenyseprosiklos.hu/upload/file/futurus.pdf
    • https://condicionamentofisico.com/arquivos/file/kexakinalemataruf.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/158d241cb5c82e5f0b5669435b09fd9c/23071085854.pdf
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/35103577667.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/xedavejaxizat.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e9216c9e5---22461813980.pdf
    • http://esthebel.de/userfiles/file/sofuk.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a7a.bin
d2e67b1932509bbc276800dbc32dc7c7696c6cb1f34b68a473c8a1a2f42ca59b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 17364 bytes
font_01_sfnt_off000137fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137FA 16792 bytes
font_02_sfnt_off00015011.bin
529a9260db81edcb47ab95d1b0da6891be0a9d957124c6a434ee81f84988e794
pdf-font-stream PDF embedded font (sfnt) at offset 0x15011 10812 bytes