Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba15c75c4d61e8d…

MALICIOUS

PDF

86.6 KB Created: 2021-06-25 15:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67394ba2ae36ff6d90a1acec6e39d744 SHA-1: 2d6519eeba91de7c0f3ef60ffe6bcfac007cea75 SHA-256: 3ba15c75c4d61e8de6e75aab6b7e721c540aab39f2a079db6c0db61c279837d4
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to websites hosted on compromised CMS platforms and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is unreadable, but the heuristic firings clearly indicate the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://alliance-ltd.com/userfiles/nogexogixamapanoxapawutu.pdf
    • https://biothiennam.com/media/ftp/file/nedaloruk.pdf
    • https://kodcomputers.ro/2664/uploads/buwubuxoxoze.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-25/20210525055105536241.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/73bf93cdf80b1e724b9be44373b8ef28/vajopaximanutosagenixa.pdf
    • http://stevis.cz/files/file/27479719180.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/3f9738bb0882bba4b6bbc2381596e4b3/jimijumevovugitadan.pdf
    • https://33mobility.net/uploads/files/81871408428.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/vdd7c0fmkna1nan2n0bgii8803/49321050804.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/9mg468mtuunp2unfld92pa38vn/xorodafubuxu.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c396db74e12---ralerupi.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/10491644dc9d0c0f0e3ec2be3577857d/88994905196.pdf
    • http://talleresjpg.es/img/file/jexumigifubul.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b9890269c---jenezubuderuxuvagoz.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896804e4210---30027046321.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6d9c27513---31029912778.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=upper+rib+muscle+pain
    • 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_off0000f2ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CE 16792 bytes
font_01_sfnt_off00010ae0.bin
071a24286410363d9e98455a820445cf2a2591a1fb0e460994ebca689af97d78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 16208 bytes
font_02_sfnt_off000134d3.bin
d33f3c5982a4d32ba9c1613d32088ba10df9f5c065e7017221e5573e4d684ea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134D3 10564 bytes

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