Malicious PDF — malware analysis report

Static analysis result for SHA-256 319bd0c029d5c9bd…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 20:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b12ddab91eb7ac0ee16b6073117b36f SHA-1: 27f259d66916fb4a7bc4d30e4e3cc73d379e6751 SHA-256: 319bd0c029d5c9bda56bc13a5074796151cfc12c3108e6997aa1b4c42270f447
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, directing users to numerous compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL findings point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/201559faac5d92a4a011b32ffc2f8ef2/wegikixesejoge.pdf
    • http://minhquoc.vn/ckfinder/userfiles/files/moneletu.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16072f01aaae4d---47073250012.pdf
    • https://autosaloncenter.com/uploads/file/pepasitujumugekatosofori.pdf
    • http://interiorconsignments.com/media/file/78087964718.pdf
    • https://sharadsangam.org/UserFilesTwo/file/49455211161.pdf
    • http://rafaelstore.ru/upload/files/75757119394.pdf
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/menajumodurijaku.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d3d29b4a447086dcd06fc4b22a3dac3a/76770074196.pdf
    • http://prosquash.by/data/37703618421.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776b7584dc9---72316359233.pdf
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/gixekesiza.pdf
    • http://debden.org/userfiles/file/paniwifogelu.pdf
    • https://gloriamus.org/Uploads/userfiles/files/11146589300.pdf
    • http://georgekoldun.com/var/upload/file/noxara.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/23e71fa8ab6d297f9f374a6037ecc915/repopisepa.pdf
    • http://sushikyototogo.com/uploads/files/vewisotame.pdf
    • http://windmill-bv.com/userfiles/files/87547053183.pdf
    • http://music-saikung.com/ckfinder/userfiles/files/43664736557.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb6fc48d3d---bamovixoful.pdf
    • https://horacebatten.com/ckfinder/userfiles/files/98555484212.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/e59e23d445e2e23b6fc250fadbde762a/kixomip.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+meaning+of+supposed
    • 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_off0000d79c.bin
79a71e1866b9536110f6e76318eb663ed67c8dce81d48795b4892388e37aad39
pdf-font-stream PDF embedded font (sfnt) at offset 0xD79C 10764 bytes
font_01_sfnt_off0000eff6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 16792 bytes
font_02_sfnt_off00010808.bin
d160738b54623b56fa29805f776f3aafad0c20d7a17dcd73b20a7c9c518f0e02
pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 17668 bytes