Malicious PDF — malware analysis report

Static analysis result for SHA-256 899b91716986a247…

MALICIOUS

PDF

70.3 KB Created: 2021-06-03 21:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e2b7350aca5f51e17434145a6e224a2 SHA-1: 94b4c81372f9d8f349bcf1b2aca754f50785963b SHA-256: 899b91716986a247d2180d2053c0e9c0677fbf473a368b3139abd138fdf218f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata related to 'Dr. Faustus' and the wkhtmltopdf tool, indicating a potential lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pixomot.ru/uplcv?utm_term=dr+faustus+translation+to+modern+english
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b2644e08d---nexugowuke.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985baf94483---3783798798.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/c3387798df5fdba92e02bebc8b619b03/jelotewokorel.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/01aaa95628a1e200562e6f1ac163963f/vewosivaf.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/q80ts6p9if27hstooeslqdgtrp/72392433600.pdf
    • https://amatnieks.com/pictures/image/43190025968.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/4kql0k0dadob7ontovpbs1tcd1/wasugogoboposuzukimimub.pdf
    • http://absolutelyneon.com/userfiles/file/fifajepaxivajivutiva.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hpbjahlrut0glb7l2e55j3atp1/27591366621.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a58c9db9011---17988862289.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/rigr6mtcvls87c7lr5isbv9o8l/30090267880.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/4f39f13f6f331f8443f5877264c48cbd/wilebinovuzejixixijisof.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105201008096900.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a74830a0ad8---97468913262.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5a3.bin
039a3582df765c3dfbe65dc9904413dcd7d64ef354bc83b5b3934c11c55a1cf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A3 5320 bytes
font_01_sfnt_off0000e795.bin
c38a13cc35e97df94903d7ac24ff0fb975806042d8d443ece0d1ef8a03cc54d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 10704 bytes

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