Malicious PDF — malware analysis report

Static analysis result for SHA-256 139f5ae2f5db622d…

MALICIOUS

PDF

84.0 KB Created: 2021-07-02 03:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c61cbc9b388006efed4161807c32c1d SHA-1: a3e0db3af52810b6256aa4dc90761158e50f5cbd SHA-256: 139f5ae2f5db622da538124a4e4567fd4f2228900a6724a1d53ae6083a5920f7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af1c3f192f0---15734425701.pdf
    • https://jagominum.com/contents//files/79261409540.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/5773j8tjhlt4v2k9d6aennmmct/49231872567.pdf
    • http://alkanboya.com/files/file///bovixaxedevowutatakiz.pdf
    • https://delphin-bau.com/ckfinder/upload/files/xenanat.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd29d0811e---85923045610.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a757a04f672---waxaxor.pdf
    • http://vietsinphar.com/uploads/files/punabokokog.pdf
    • http://rgn2u.com/userfiles/files/rexebab.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5cd8d75e2f030720164d446987ee94fa/46784624016.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/969c4635b9fa014b36911141a7824b14/dakotureguwutamabusoziwot.pdf
    • http://mwflower.com/upimagesfile///23182296073.pdf
    • http://honda-vo.com/upload/file/gukex.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/1k9r28k0usrrr4v7v8krgfahfe/levojanafa.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/m274i46ncodsor47840anffq22/vowujepuwu.pdf
    • https://cr2tek.com/userfiles/Proj_Name//files/botagitiviloxuliw.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/dbd3050e2dd243bd9e3b9fa3b8921c2c/67779931021.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa70048ea---depupuzonagomori.pdf
    • http://51-lq.com/userfiles/file///89052847253.pdf
    • http://eastcoastbiker.de/sites/default/files/file/nunigedojakegesadiruji.pdf
    • http://amoy-art.com/Upload/file/komujibipijemupaweme.pdf
    • http://citywideok.com/clients/75789/File/76524013489.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=file_get_contents+php+file
    • 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_off0000e5b7.bin
a4f05b51d43704eec040aa27178c5a2ec5b77b73a358a4033c7c805ff169ccb2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 10508 bytes
font_01_sfnt_off0000fd87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 16792 bytes
font_02_sfnt_off00011599.bin
094efa6854ea61f0e83c471db543f6d2aca4b05ec18fb443936b9f19e3201c99
pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 17284 bytes