Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4217f43c1181177…

MALICIOUS

PDF

84.6 KB Created: 2021-07-23 15:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: adff1acd31bd892dc337d93aa2298f6c SHA-1: 307f8d0f4ea24bdc5a05bea6f4536d1bc41f738d SHA-256: c4217f43c118117742842e6f5fe3f769a8e81e4374579eae97b9f4eebf18d43c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised websites, including one hosted on a compromised WordPress upload storage. The presence of numerous external URIs and link farm heuristics suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gemwares.com/userfiles/file/12605042664.pdf In PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/eeaf6f0184138e9aa2d0bbaab535e8b9/99461322856.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/13729156596.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/vegaxujezolemidewatolage.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/69929276788.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/49826979709.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c0dd3f92---xogerum.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/18234413796.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/20752799401.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/pewuripe.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/577c03cca170b2a472c245dac0d6c056/64160766119.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160bd91c84a64e---jajowagokowiti.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/docjccvs4tbu9cc9kq9f1vhj5c/zamore.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/25f3551fb6bafb8fd0ff49662044813e/33785575164.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/aaa06dee48cc536d635b88fb2ca5a9b5/73018554395.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63b80eb9ab---48598228081.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d4b0c14ae---58664843189.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/54599869608.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091090cb2b3e---92806000691.pdfIn PDF document text
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/66508523695.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s395u2vkf974kiii19jv54v4p0/59225648195.pdfIn PDF document text
    • http://mp-journal.com/media/file/gabaxo.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/3953583998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=modal+verbs+may+might+exercises+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FC 11380 bytes
SHA-256: da578b2dede152cfed5128b3a9f7b4f6ded5e22636ab91f534e2483f71c9b18f
font_01_sfnt_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 23128 bytes
SHA-256: 4bd989728fb0e58fce49a95b6df5c8b7d01f5a3281fa0f576b1767526efbd9f5

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