Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d87d732c7cbe834…

MALICIOUS

PDF

91.6 KB Created: 2021-07-01 14:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3a709a180cfc69aff4f52211d754b9d SHA-1: c33bb00f9064db418367967eeaa22e589a8e0930 SHA-256: 2d87d732c7cbe83457a835f8e44769a6bebabde164e16eb2525dca07283b819c
196 Risk Score

Malware Insights

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

This PDF document employs a social engineering tactic, presenting a lure to install a browser extension or update, which is a common method for distributing malware or stealing credentials. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm used to distribute malicious payloads. While no scripts were directly extracted, the PDF structure and heuristic firings indicate malicious intent, likely involving the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://medvor.ru/uplcv?utm_term=brave+dark+mode+android
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/7ee5789991dfd127d2b95de879a56606/68222509877.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/99f13d26d67acb262e247a480b154235/jimewexux.pdf
    • https://blindnow.com/userfiles/file/mexizadesonoli.pdf
    • http://tecnoservizi.com/userfiles/files/wumuwobirozamewarele.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc6bf3a02---fowemaliluvavupotinuper.pdf
    • https://luathoanghuy.com/uploads/files/99986945615.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5201c55e4---91367883944.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/81698402579.pdf
    • https://tedvandergulik.nl/userimages/file/kidazonu.pdf
    • http://fitsiluet.cz/data/file/16481597424.pdf
    • http://ainut.fi/userfiles/file/podiropopiwat.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ioa3of4s2qjlk8rrhk8h54jn12/tusozepelorukofavubogi.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb2b76e60a---70738116416.pdf
    • http://www.alcera.ca/userfiles/file/kuvatitasubuwexu.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609427951319b---92148452343.pdf
    • http://dakmet.pl/upload/dowerexanexeviz.pdf
    • http://cf-solutions.org/app/webroot/fckeditor/editor/filemanager/connectors/php/imgmedia/nomumepapa.pdf
    • http://hanhthien.net/uploads/file/zoribivasisugiduduregiwed.pdf
    • https://viscom.bg/uploads/wysiwyg/files/38989530479.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609985e5d69e1---fagupewewowuj.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b82a7e8d02aa324ff477d64d8400ce08/nuliwebato.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb1.bin
6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 16068 bytes
font_01_sfnt_off000103d2.bin
4c2d5ab9f62e6a3e4e27dce39eef929c96ce40a43bede348c01b3e841a533bfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 10308 bytes
font_02_sfnt_off00011b03.bin
496370430404e7d8461fe26a673cbb7a312e19165c0b42c837b2ce052ff3ce34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B03 17504 bytes
font_03_sfnt_off000148e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148E5 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.