Malicious PDF — malware analysis report

Static analysis result for SHA-256 c873c4921d4cd562…

MALICIOUS

PDF

75.2 KB Created: 2021-06-25 13:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 081c288d6a87c87434aa5d071c7dae00 SHA-1: 44c40ed40fc748cceb506739ebd48681d401dced SHA-256: c873c4921d4cd562e2184fb407567a764131264113b66c1ed1ed45936cda7e19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609832d7b910d---44898967045.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607afd110e993---tapoxilipere.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/bf84aebe723cb32a178272322b6b5424/50246670708.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160860601c117f---6879748336.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac696b3a122---47014575100.pdf
    • http://php-lounge.de/userfiles/file/62472142709.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082b5e1c4a50---65803198153.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ndrqccc3ufsehntqehha4a5qvb/94452481392.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/iimujss6otaoouee1563kb25i1/98722167602.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2585f3be610139b54b848831b77a8ed1/28981504071.pdf
    • https://balajitutorial.com/admin/userfiles/file/vijisekebatix.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160852e813ed35---sosekasawu.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/724c11bf58908cf0ace61d6badeb3eaa/50760233452.pdf
    • http://mya1fc.com/files/ckuploads/files/xedupezemafavag.pdf
    • http://unseenadventure.com/userfiles/file/fisolasezuledi.pdf
    • http://africa-emergence2019.com/userfiles/file/wavutukufugagasodogut.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bba4c1c145e---jiluzubokameto.pdf
    • http://hzkontejnery.cz/ckfinder/userfiles/files/tojovesososiriri.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/5t9opaksnlugi34gjcv2dnrk12/bojufabazexidonu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=buy+soft+copy+books+online
    • 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_off0000c584.bin
4086803032ca83a6541099997e3ad8c876df0891a63bf9da1dc82347acf3f2af
pdf-font-stream PDF embedded font (sfnt) at offset 0xC584 10708 bytes
font_01_sfnt_off0000de21.bin
239a3d5c77689f00b76c5d53e3c5ed85503fbe4c2af0e28d128f12bb147ae529
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE21 16136 bytes
font_02_sfnt_off000107c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C4 16792 bytes