Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4f25633796ef68…

MALICIOUS

PDF

72.4 KB Created: 2021-09-04 06:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90e1c1db915fcdacaed0b91d494902b4 SHA-1: fa7876d2f3e02ff3778accadf90498fbcfd54926 SHA-256: 1a4f25633796ef6841b51dad823c41aeb5e3177f00e358888c3b42d42839d0cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the link farm structure and compromised hosts are sufficient indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://coretry.ru/uplcv?utm_term=laser+egg+2+manual
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/585fa84e8127260e10b5b97e68f2913b/jobewurujewudirurixuneji.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/342368f72ecae63b1816067f59f417f9/magosakedawaro.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9ca9d00abbe6a9885b9112dab5ce6654/42728359918.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607484ab5c18c---897973028.pdf
    • https://protrialse.eu/files/files/16930944015.pdf
    • https://nmg.lv/img/uploads/files/morixanusaf.pdf
    • http://strandedtattoo.com/file/xusimeladadajajux.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c409858f061---xujapojatinewus.pdf
    • https://seikai.jp/free_images/files/21407482707.pdf
    • https://autoprofi.ua/userfiles/file/tinuwun.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5ac1cbb15---27462795573.pdf
    • http://gelateriacool.it/userfiles/files/bakowowonezixateze.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/rexejit.pdf
    • http://spalovnachemolak.sk/userfiles/file/9370889592.pdf
    • http://jhdljz.com/userfiles/file/1627958015.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/6dfpj2rofuo8espkldmicrqluu/57778368050.pdf
    • https://projectmine.hu/ckfinder/userfiles/files/67156304445.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ede3e428ed---87637212202.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/48639802078.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/1ad7189fa0f2b67bf1a2c8f53c4e42a2/50595024793.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d198d87e11e---sagipotuvuwuwitemurot.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddbeabc60a---30848469153.pdf
    • http://wintec-samu.hu/uploads/files/befuxanovomomawek.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0929807262---lefavetuvukufokexamabakek.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/aphaea9u9l7riq2u9odf33o2da/74824866939.pdf
    • http://ndt-ultratech.com/files/89429262955.pdf
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/xoxaxos.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_off0000b9da.bin
425772a79c4b655c45510b0b09d0f7da25c31661ab6c64d358d160aa9c53d4a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DA 16748 bytes
font_01_sfnt_off0000e45b.bin
867c52719efde400c9b002d0a4cecb41c5597d8fc0e9fdba06f30ac7fad88f67
pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 10316 bytes
font_02_sfnt_off0000fba7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 16792 bytes