Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65cf4ac2a0a83f0…

MALICIOUS

PDF

97.8 KB Created: 2021-07-01 19:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ca27ae037def1804da0cf786c63f238 SHA-1: dab6b9532827cbab0d06820a9bcffc3f0c47dd11 SHA-256: e65cf4ac2a0a83f033e7b07a98ed4fced4165d4d5e085e83f97fa3d053dc55db
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to host further malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to evade detection and maintain a low profile.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/c5d3499003a0aa9cb0fb097201d5dbdd/xekadudapepisi.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c13c301ea2e0eb58ce248521ac331fd9/lekabo.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/95183284912.pdf
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/20626446356.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607595d2d6c9c---63578140466.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/59cebee50f3ee50d4401c6c37e592681/tetok.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5cf407df---vukisifipu.pdf
    • http://getem.plfiles/file/87531255982.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8mi50f7ithin2hi6c8ogivgl17/24490391229.pdf
    • http://t-p-fortune.com/userfiles/file/73844994717.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/dm3orvgv8uqt7onrs00fu3ev5j/27436737441.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160850591e8f65---wosapox.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/hoes8qr2a37qouqolcsvr16220/dukonaxexexatu.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/murfu3kdmfqh7h97rghohvq9e1/2255245085.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8998ca5a86---92505664588.pdf
    • http://rld-carbon.ru/file/pagilivuvetikotofukojad.pdf
    • http://happyhanool.com/ckupload/files/34351633068.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb4ea669c3---1549958669.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/4ef59dc7511513f8378e82dd004b31b5/vajuvafetub.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8016d3b78---bowonuvigolijifevuzejobig.pdf
    • http://iphysiology.ru/upload/13908329907.pdf
    • http://volamtuyetthe.com/userfiles/file/47607855140.pdf
    • http://www.thaiboat.net/image/upload/File/43557678778.pdf
    • http://apnorajasthan.net/userfiles/file/gapurivekonasazukoloru.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eea56e9789---94320337131.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=thank+you+jeeves+pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fc6512561---suminurej.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_off00011cfd.bin
15e7fea6bdbdeae8d60366aa11285444342686aec8576ae147d2ae116207c6c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 17132 bytes
font_01_sfnt_off0001495e.bin
d83a29f5404751c079735ff03629e707ba0aff443dfeafe9263207a3d191ef43
pdf-font-stream PDF embedded font (sfnt) at offset 0x1495E 10724 bytes
font_02_sfnt_off00016204.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16204 16792 bytes