Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f60d5c9822a4dda…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 23:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4da0d104eb3f4f7bc7310c32c8b07fbb SHA-1: 7fbf1557155b50723ac8f205593a8289020618cf SHA-256: 1f60d5c9822a4dda41da417e01884344f59421b2b36b6b1da64a7926f1e5cc96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is unreadable due to the wkhtmltopdf authoring application, but the presence of numerous external links and the 'link farm' heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://lensmam.com/userfiles/file/94591801981.pdf
    • https://ctcitsupport.com/media/files/xufomab.pdf
    • http://caythuocdangian.net/images/files/53349838130.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f25a61828a9361d61a13b264c15a6414/kezudikerabepaxewumebev.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/novefaxonabowuluw.pdf
    • http://www.farnostbobrova.cz/ckfinder/files/pefodomozojuradamegeralaf.pdf
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/duwesud.pdf
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/rizulugogap.pdf
    • http://beastyenergy.com/userfiles/file/51013120862.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e48c1fca9133cb7e9b04a315631086e3/potofunan.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a1cbb7901---pabeniroxe.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/c8a82aab971a4127d07859401d08454d/fekapuwugerinedutulu.pdf
    • https://profession-your-dr.com/uploads/files/202109091626373277.pdf
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wumuni.pdf
    • http://imobilestore.de/userfiles/file/29761735732.pdf
    • http://isotope3.pm-ural.com/uploads/files/83274495730.pdf
    • https://legouic-peinture.fr/userfiles/file/23500303645.pdf
    • http://syarmarka.ru/userfiles/files/vufiler.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/e78e95f8b6b071b392295f9c3efc115d/61196636645.pdf
    • http://gabortech.com/admin/file/83475068930.pdf
    • http://t-p-fortune.com/userfiles/file/53860761538.pdf
    • https://doktor-ara.com/userfiles/files/12263892482.pdf
    • https://phuketwebstudio.com/ckfinder/userfiles/files/34161644215.pdf
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/31287955877.pdf
    • http://kanalizace-ul.cz/userfiles/file/41145823500.pdf
    • http://na3.it/misc/file/24383875090.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+good+fight+season+4+episode+1+watch+online+free
    • 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_off0000df86.bin
6c5fbb16921f2bb2bb9bd2f96eac2a454dd536e14b380eb166bf5f26a41d846c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 11076 bytes
font_01_sfnt_off0000f942.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 16792 bytes
font_02_sfnt_off00011154.bin
aec9c0042fa0aa77ca4f11db99b1a5e489e3345d36b6231a45b90d7ed123f31d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11154 17744 bytes