Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b7998390025005…

MALICIOUS

PDF

137.1 KB Created: 2021-06-25 15:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4083a8b361adee036fa188d50ca5950 SHA-1: 68feb78f059e0de45511fb55100061add62f5934 SHA-256: c3b799839002500583edb14c63413195459a7eb68786d407bdc73304e3254e5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://catamma.ru/uplcv?utm_term=sneed+middle+school
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6c9550c9f090c84d65974420db47db88/pexomapizubuwupulaki.pdf
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/e5b8f03733ba367d9f06a03696edeb39/duvidogem.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0a5659a0e---jomukakevini.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nds7bsnu7ejkh0slts4ttpqv20/3625671437.pdf
    • http://www.buildingmalawi.com/images/uploaded/documents/natutifokefi.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160977033956cf---84136277458.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff72a31ee1---jiduz.pdf
    • http://msinziniering.com/userfiles/file/fufiwuxafisafolurivew.pdf
    • http://computer-rudolstadt.de/upload/file/89501939552.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a1ce1012b077eebea5375ca1288f6a2c/rixejifokeb.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093e4a692fd7---meziferukuredi.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210527180815.pdf
    • https://eternalbliss.net/file/zifaranadakorarobobi.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/0500a60bbe55e3a1363a942d051186b2/gakudilanubosu.pdf
    • http://xboxheerlen.nl/userfiles/file/dajudurodipir.pdf
    • http://carshopm.com/js/upload/files/bajuwonaraxiguj.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e54c00510f---5926739814.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608757ad108b1---popejuluponuluvapis.pdf
    • http://pinturasoltra.com/images/slider/files/pegap.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a4a205ea---vizirokisezafaninoxas.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_off0001b91d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B91D 16792 bytes
font_01_sfnt_off0001d134.bin
5d600b027cee83c8e4fedd9bbf6c864f8a20bfafc9923794517893c433b7c14e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D134 10348 bytes
font_02_sfnt_off0001e842.bin
0739bd7c1df4495efb9a049539fa494e758f30b86fbe2563048368872d96f985
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E842 17880 bytes