Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5e46c85a328bea…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 12:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ff7c0acb3af3f7a2edf78c9e7591742f SHA-1: 8073301143258a38e5b3b7d4ac72fd7c9e4f3702 SHA-256: 1e5e46c85a328bea3cdc931b0a19ddec6a30809331feb57dd100b7f3ab70e8e7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to download further malicious content or visit phishing pages. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5588f0f1b---95923598597.pdf In PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/qmvs06jbelmdk6tepojggh6i13/4261704302.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/50999776868.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abc2cc6066---21263190689.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086d97fb0e5c---94801723722.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/46859022799.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/xikowuwugapezofenijan.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/deteripevudilojep.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aae9109e65b---56729838766.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/64e3d68769436185c2b52e3c61a4b8e9/30575877701.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/68979498297.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/94e23beedaf14ec27edcaab902ba9672/88944255258.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/2a11a0b3f69e68b009575614ed0d0fb2/wulazasemu.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/libavubeziza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609464c3653d2---zotulivakuguful.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/tuwiwi.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/28766727992.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/bomijojozed.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/saweli.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/88257921365.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/beferasefubunuw.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/73343733041.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/fgjgpgm6n75q8ua4vo1pf7kub8/dulufofipononalu.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/lakolikivobugiwomageta.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fbb6696e1---mafabosikelutenamorixu.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/bofagaranokunotuxuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=insert+pdf+file+in+word+2010+documentPDF 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_off0000d3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 11048 bytes
SHA-256: 2d95e63e452ec7e0c9cb8a105e5fb04335d338d268ae899d54799ece4de61b19
font_02_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 17328 bytes
SHA-256: 2d4e6d89d09c71b1005f7d524a52762615de44eb09c7a9caf022cba98ff2c909