Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7496a58302006d8…

MALICIOUS

PDF

82.6 KB Created: 2021-06-25 16:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 738256c010367fa3b648bb0be749ce44 SHA-1: 4605a25a94136381e4ef6d108c92b95fd0faaa03 SHA-256: e7496a58302006d8a8f243f6dd2ac4eb653a21e97c142b96ac5c65581c8989e8
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://musikkursus.dk/userfiles/file/peroge.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16076d6f06c7c3---zovesuxaferawuzefer.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/00es24dt6fg9s634klp1fd01lu/wovimowigufefikoxezoveti.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608141c9ee258---nesonotufujudoxake.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071a9bd304ce---bigowipiv.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/7161b91e8bb9c1796d9a8bcb928bab4b/gewofovitalisovepixu.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/nplgdfe9bnlu0epha441399683/285232584.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/157654e0eb665cd880342b13c6691fee/20665314741.pdf
    • http://urjabatteries.in/userfiles/file/tuxet.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac61137d63---xepipuxaburado.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609590da26790---zevaxalus.pdf
    • https://fotofidelity.cz/userfiles/file/23017037531.pdf
    • https://autotrans911.com/thread/admin/uploads/file/82226706359.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e61947c4ca---zerevoludolazapuxabob.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=semiconductor+materials+devices+and+fabrication+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_off0000df5c.bin
477a9154111687a24083f70c91ecb97d4e2da7af1128adf0c1d6d3e3f3e893b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 11164 bytes
font_01_sfnt_off0000f93a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 16792 bytes
font_02_sfnt_off0001114c.bin
8c994c4abf4a84eb2efcc58f255d54feff4dce6487634985a512a24a32206691		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1114C 17004 bytes

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