Malicious PDF — malware analysis report

Static analysis result for SHA-256 4321ff72f13cdbe3…

MALICIOUS

PDF

88.3 KB Created: 2021-06-27 03:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35394f94b040649d7d7a9ee578021adf SHA-1: e80c0bca298315227f1115a8c36d54b6e9fca8da SHA-256: 4321ff72f13cdbe364096c75212d9c639503a78eb3d0b4f6a332822871728d62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/8b1c6e856d83d30ad13c562330910586/dawosupazinelo.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/sekova.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc42c1033b5---golomulor.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820606f122a---zusixarinafepozo.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a522895d80---xusepebijewobat.pdf
    • http://chromowane.com/userfiles/file/gegawefujuz.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/t5dud4dtotg5ggsonm98i27jlq/vurozabuku.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ac469247458---61741478719.pdf
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/37938260927.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608faac302b03---govexilunebizujatawifaviv.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/la2l68adrnfi4nmh1kjrutdbcs/57795272680.pdf
    • http://ajtoablakcentrum.com/_user/file/guxolafirosom.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/f4435b5287f2d043bb24ac588235bb54/22605093963.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a26a06b8f2d---67231835293.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/rfaetnkf73cnonid8fgmvaorfl/50890208878.pdf
    • http://timandlor.com/userfiles/file/wujakivipifafimifejuz.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/91mov454h3nmlvj5cc0t4q02v3/62311752187.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7b1a9a17f---zapasojowugokuw.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b865d9770e8---jamajerotudarusonede.pdf
    • http://aeronautike.com/userfiles/file/31064882988.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/a2n6g5tp96rs806h84t7m3mhca/93700371812.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/3c2hgj4a2vcjqvng68ubc3me9l/fevuzeneta.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/v6hsos0s0119unb8uql850qios/14626478336.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/694u67ulu6l4u4uso8durcf020/62729119888.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=need+for+speed+underground+2+free+download+full+game+for+pc+iso
    • 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_off0000f2b3.bin
a23eb08436691ff5168b8a2b7884bdebc9849ddd16426d19d5b48d12d2505936		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 17160 bytes
font_01_sfnt_off00011f75.bin
d2b3b2f9de3cca937675044e5f0d3a89bea5ed638f6d8cf49112c5b1bfc7ab11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 11148 bytes
font_02_sfnt_off00013969.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13969 16792 bytes

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