Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d89d6d340cf3c0…

MALICIOUS

PDF

115.3 KB Created: 2021-06-16 20:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d95b4415bf81b052359eeabdf8ec8ae SHA-1: 8df7bdfaacdfe04a607634afce9032f63172806d SHA-256: 05d89d6d340cf3c0e1f983356a9b4fae8a1f0aa5c4d68f3f7ce699332b9c69f7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier strongly indicates maliciousness, and the presence of multiple external URIs supports the attack pattern of luring users to external sites. No scripts were extracted, limiting further analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://oniceh.ru/uplcv?utm_term=wow+classic+priest+best+in+slot
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e594076a4---tenagewevugadukapavekozi.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/q5dp5q1sl1cj9a6fnv8h14b6ce/92388369041.pdf
    • http://hani-bee.com/userfiles/files/60881321128.pdf
    • http://poorclarescork.ie/images/sazosotewapaxojuku.pdf
    • https://bahia-group.com/ckfinder/userfiles/files/27795848418.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/mgu2n52sf60qub28ub1e1aulan/tabuluzapezawuvobevikuki.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/551296251d3b7e9c2944e3d1d1fe27f7/82686602267.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf9a92e43---53730719397.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcd90df522---40648456738.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839119d3990---21848564878.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608381f00fb20---259982313.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082f029cf6f1---weloruzogorusufuvene.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/sf282aoe73bas2afbsh68ahe40/nituvixewaruzumarosir.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/oldhf5aats34agsu8ju0ap5ao0/pilebadekoni.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d5b949451---kukekixazotimubufi.pdf
    • https://llibreriaha.com/img/events/file/sunokufoveberujisoseb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off00016fdd.bin
66ac92fc4c19727c0a4ce8b18c48876e3ea2670f0ebc59496493ec1c1befe0f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16FDD 5172 bytes
font_01_sfnt_off00018199.bin
c69d6bed89fee30593d18e1a6ee430f90ef92e302fa9be536e80642a989bf75b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18199 11608 bytes
font_02_sfnt_off0001a90c.bin
4354bd37e85197a997b2f6c8c8698034d2711068b41d1b66819094364c364bcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A90C 16544 bytes

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