Malicious PDF — malware analysis report

Static analysis result for SHA-256 421a24f24c60a1e3…

MALICIOUS

PDF

85.6 KB Created: 2021-06-25 13:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 158aa9dfed100feb572206d82322ae40 SHA-1: 25156b483c8e6cc6b089a05d0eff769b841253f3 SHA-256: 421a24f24c60a1e3d63791a56052a74408aaf24c67f3716419ca5a434b3447f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous external URLs, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The structure suggests an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://tahitotfaluovodak.hu/ckfinder/userfiles/files/77655701221.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f9977d052---xuvobelifasidigej.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768631a8d11---98172339748.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/67bb73fd43dd9bd4d93c88d44ba6f278/9265153612.pdf
    • http://eprdel.cz/userfiles/file/67860785217.pdf
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/68165119568.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/bc8c91c7972a44b806ef1214cff0f835/nesaz.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4d1dd918fc642efd945e3f48a4b520f6/temenokalemakob.pdf
    • http://hayatteknoloji.com/webimage/file/bajadedegasigadi.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2d12ae237---9135414291.pdf
    • http://macautemple.com/userfiles/file/subowemofo.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b284853a1b7---roxidaxigegawobomir.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860f29689e8---22851923761.pdf
    • http://magogaralbamoble.com/galeria/files/lomaduwimuvezibaponoma.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/70ce77718678b271cfdeb98f13ec11b4/lonaxijemazafijof.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/s40p8b5dmja9omvqtjop1n5v4s/62356153405.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/a85f086851240b43e13c06b6deaf2fa7/61530255604.pdf
    • http://ticaproduce.com/ckfinder/userfiles/files/garaxuzoboko.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=long+words+with+k
    • 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_off0000ed0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 16792 bytes
font_01_sfnt_off0001051e.bin
2020950d50a56fd99e82b8c043e0dd33722d2e500c657aeb9e81f11031f70a1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 17040 bytes
font_02_sfnt_off00013162.bin
b0ac16a53f5dd81d91212c6bf84963562abd0f28c746cb874f9e79a39c6f1ca6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13162 10324 bytes

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