Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fc4179a3cbef3d…

MALICIOUS

PDF

86.9 KB Created: 2021-06-25 15:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebf17d55978b9ff79ebceda7061076cb SHA-1: ccbaa63b9bd8662b7f1f8cf5e63564b6bab48476 SHA-256: 10fc4179a3cbef3ddd4362e66b76f84aa93fb5be0efe792fd210e9f3d705f08b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=hector+and+achilles
    • http://pc75.net/upfiles/file/1621866350.pdf
    • http://nw-line.ru/generic/uploaded/64720410072.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c486d0cb64f---namoboji.pdf
    • http://mobilesamara.com/img/files/file/26374139764.pdf
    • http://northcity.rs/slike/files/dipuvo.pdf
    • http://ahsaipu.com/v15/Upload/file/20215101317302263.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/b2ce0fbf74d91ad68765c85f71cc9540/83539681512.pdf
    • https://sportsht.com/userfiles/file/vixeliluteloregixumog.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a192427514b---fetuzupodebaje.pdf
    • http://alnadaoil.com/userfiles/file/13499978305.pdf
    • https://alexandrapanayotou.com/web/images/static/file/95982509130.pdf
    • http://garagehayashi.com/js/upload/files/nituxuvegerigutolijo.pdf
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/3483646433.pdf
    • http://richmediahouse.com/admin/uploads/file/72486456497.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_off0000f4b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 16792 bytes
font_01_sfnt_off00010cc8.bin
cee49cb61615e428c025d867c910a527d61e5a870cc3cbccf4ffc3568d0dbf76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC8 17072 bytes
font_02_sfnt_off000138c3.bin
f4440b8deb9feac8a35c7c481f69da07dc62f18e5d9c6493512aa396396d8df0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138C3 10456 bytes

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