Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b333d290a0d6583…

MALICIOUS

PDF

85.3 KB Created: 2021-09-11 04:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ce32e3c2c76e1767e579339e2f038e05 SHA-1: 1408a135e3b0aa2667c6f7df1102651bd6f968b8 SHA-256: 2b333d290a0d6583952605205a7fa528fd35401adafe3a75822563297c6f7275
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing malicious browser extensions or updates. The presence of numerous links to potentially compromised websites and disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://euroear.eu/ckfinder/userfiles/files/84750107402.pdf In PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/51691491351.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/naroxagezobewobawafamij.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/38642673490.pdfIn PDF document text
    • http://www.heksan.com.pl/file/gusidevu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/bb0f262f78401018067fa9e5db43beb2/81564413211.pdfIn PDF document text
    • https://mbbs.hr/files/71734619301.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/gufutoj.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/11194377113.pdfIn PDF document text
    • https://km2804.com/ckupload/files/birojogex.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/pimububejisobavoraguzunun.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136d4d5a7f07---41326030967.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/pukaragixuwopetiwisosijo.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/25436736433.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/sefegug.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/kizekakafakidin.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613690f2a9857---57306572756.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/66299951277.pdfIn PDF document text
    • http://rentaruedas.com/files/others/151746598.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/22483196190.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/winejonul.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/wifozoruxefuxukenepeto.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/be281a79ff18361d27b84196927f070d/lijiraremenatogezakapido.pdfIn PDF document text
    • http://airmon.hu/images/files/folemob.pdfIn PDF document text
    • https://rajakedua.com/contents/files/wulidukifam.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/vojenovejikij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=renegade+raider+account+for+sale+freePDF 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_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 18332 bytes
SHA-256: f96219b66df1161109dc42604947b34f87950789d10956e2a5f7640e9012dc0a
font_02_sfnt_off00012e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7A 10796 bytes
SHA-256: c36b6c5e9d41d1b4a03bd99180d44a6d561829714eb895fcc7bc252387afb3e6

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