Malicious PDF — malware analysis report

Static analysis result for SHA-256 829c094dd24cb06a…

MALICIOUS

PDF

59.9 KB Created: 2021-06-23 12:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6b40a320a9938af55308400ecf10468 SHA-1: 6105ec57652062f60d0c29c248debbfbfe40b300 SHA-256: 829c094dd24cb06a31369a0283922333e18ed4cf400c9c58170dc9ab25d67466
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm used for redirection. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lead users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://almoheetmanpower.com/public_html/userfiles/file/zelidinerexena.pdf
    • http://josephlillianmorrisfamily.com/clients/59960/File/58718761260.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/bavevejizedapiran.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/27002141287.pdf
    • https://baongochoa.com/upload/file/23757498144.pdf
    • http://nguoigiupviec99.com/webroot/img/files/17662592913.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d09f3d634ff---sawilemopu.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075c10c57732---81449819380.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/52deef5f8c7ec03664cc5347fc773206/seguvijufobovenugebu.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079a5524b328---39869569427.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/1fd00cf1e5d6b959506963697e0b3c28/99467480995.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608521a109c57---xewarafugetetix.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/eklsn8rg5mjfo9kona0v36c2mn/73066015697.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/1e4e15381824d2ae04eddfeb0a2d715a/27635462628.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9f3c5a46732395f3a0bf01fda34e402c/nowabomi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=adios+nonino+guitar+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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afea.bin
dd727ccaaeb4b52ed482431362b92fea843d66688009933c1d39cdd26340a3a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEA 5164 bytes
font_01_sfnt_off0000c186.bin
677ce8e1b549ce00b5ac313f29c7ad0b4d9d344aa2eec32c6d3acd7833ea267c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC186 9856 bytes

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