Malicious PDF — malware analysis report

Static analysis result for SHA-256 685986c9ef5b12f8…

MALICIOUS

PDF

85.2 KB Created: 2021-07-13 13:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2f0bbec9adc685f33b00fe0728ff4f46 SHA-1: bd417aac75a4e1850d29504ce79b2b3f970664bf SHA-256: 685986c9ef5b12f8d565afa4e36c1ef9e533f889f3c581743c54042a5e6b571b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://infrive.ru/uplcv?utm_term=the+hunger+games+chapter+25+summary PDF link annotation
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/5drq3ioj5i0tkg68gr0sf66r37/lawurulufirol.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/79144902717.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875e5a0e4a2---46678226346.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/58787723177.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/zomabufamitajagodozalepod.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160903116ee11e---37853990412.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607972e1e6b79---21627984732.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/41030243202.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb8c0d803---81592079683.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/3742404281.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/1e10a112199400f79d52376e33c49f80/koxarupiwe.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c375f0340---14423094592.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d32ba768a4---99130257185.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/kexipowusezuzibulore.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/26393011912.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/runenu.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/88a875f099f7add4d0e40707a9108c20/dumisaturepozose.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b18b28b6f---rapuvi.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/jibibuvojesulibipexep.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/10998780475.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/kilubigogiloterugazog.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 10996 bytes
SHA-256: 277c2734433a9efd3a47986914740849d5e30ca1399fbc62975aa2b67c1015b3
font_01_sfnt_off00010492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA4 16732 bytes
SHA-256: 55ae7d89bc82a03823d4e0be8ceb52a84ef880a180147601b992b73a68626350

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