Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ec2b8d86a74547…

MALICIOUS

PDF

93.3 KB Created: 2021-06-21 09:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00b82c98f9bbd2b33099af9957343419 SHA-1: 9e08ec0b184409e16793057ac8d522fdfc102bf7 SHA-256: c8ec2b8d86a74547ec7480c8e8d63f2c1f239a5648742d368b9edb5cd9ebecd8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is classified as malicious and exhibits characteristics of a phishing lure. It directs users to install a browser extension or update, a common tactic to facilitate malware installation or credential theft. The document also contains numerous links to external websites, some hosted on compromised CMS platforms, suggesting a link farm or distribution network. No scripts were extracted, but the overall pattern indicates a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=can+you+get+minecraft+for+free+on+chromebook
    • http://szao-spb.ru/images/news/file/92092776469.pdf
    • https://mytekas.com/UserFiles/file/kowenu.pdf
    • http://hungthanhauto.com/luutru/files/24697920115.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/caftcsje6uf31hdbefedpe6m31/24214033161.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb196e5ec4---87450318012.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/82344000113.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fc70086c5---95945925289.pdf
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/71745887101.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160846374997a6---sobupukoletipe.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6orr4u2vo6vjq7nmsb4mqs4291/muradinejevazejado.pdf
    • http://kasargod.net/uploads/file/6389167501.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/gananosuvapifer.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c09429a4017---88130659655.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0febc65864---gozunumuledabakigeronejar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130f1.bin
b105c1a0ac17df7665762022857d2135efdf9cbc4fb16fca510b328630364279		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130F1 5296 bytes
font_01_sfnt_off000142dc.bin
d486b892c108031bcd239ff17a8dc9214212c9b7932cbf76348abe73937bd725		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142DC 11124 bytes

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