Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f0fc2526fe7b31…

MALICIOUS

PDF

85.3 KB Created: 2021-07-06 19:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1441ccc39cb8858bd6b07350b82509d0 SHA-1: 6d041942c0befa373073d72861500380efd655e3 SHA-256: e6f0fc2526fe7b31b5fa8f39c1c6544ecc1d42508db015bd749d476ae8976378
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The primary function appears to be directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8a098da0c---28465086147.pdf
    • http://reutlinger.pl/userfiles/file/mekogojonaguwadu.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/kh38iihnd10j87024v3q8200ku/jenunevuza.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dbee437c4---jamaxavimofowa.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/mad9kel6tvnudb2mbh9plh7124/finagewakimevituk.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/18745027816098a07d6048a.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b2b96783e---zepepifavakevunujakis.pdf
    • http://baikalspring.ru/ckfinder/userfiles/files/5124426872.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a30b189f0b---74084549586.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ujbad2698pd6jkbfos9489d7n4/kopavazodejulisusaj.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c5777cc1e---47813229408.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb2c3cdd2---vovufotowudivus.pdf
    • http://classicalgardenornaments.com/uplds/file/xorogusanaxubunezokokug.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1f58c9b1e---dofisinozolepefe.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca91ac727f---lanal.pdf
    • https://psfund.org/public/uploads/files/cms_files/siwigap.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/6c40385cbc2294bf082c35f11f34c99e/73798682502.pdf
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/nagozulopaximufiba.pdf
    • http://www.vnos.vn/app/webroot/uploads/files/22855508644.pdf
    • http://timandlor.com/userfiles/file/perazexowivezuxufetob.pdf
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/badavuziwusovojub.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=film+outside+the+wire
    • 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_off0000eca8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 16792 bytes
font_01_sfnt_off000104ba.bin
af8f866b2be6339420f5790a18419067c0a22b623f5513d494b1ebe151b6bd8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 16952 bytes
font_02_sfnt_off000130b3.bin
9c8b9a8d225c97038f8a86e7a2edb817bd60100db46613c429c3cb480779a5a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x130B3 10408 bytes