Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73ea1b7ec6fffe7…

MALICIOUS

PDF

76.6 KB Created: 2021-10-02 22:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 368331a86e2206706c00b9292f07ad14 SHA-1: 5ec3caa8cd93602b36266668d0382767eca9a44a SHA-256: a73ea1b7ec6fffe794447c084ec46f2bff24db7ddd1dedf88fd54daf8202c19a
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing a malicious browser extension or update. While no scripts were directly extracted, the presence of numerous URLs, some hosted on compromised WordPress sites, points to a phishing or malware distribution scheme. The document body is unreadable, but the heuristics and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://sentezetutmerkezi.com/upload/ckfinder/files/16958591158.pdf In PDF document text
    • https://alident.centralcms.cloud/galeria/files/45578785509.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/37924611548.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161589bbabecbb---6400446125.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jarejujoxegasijufalag.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/vovopavebi.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/75108899560.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/54153190493.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/91919205838.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/3a9ff126abeeda504fee4e84c5a79161/xunagoniz.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/zaluselulinarikekoros.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/18966347219.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143b6a6c11d8---15333621791.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/supifizagixegumama.pdfIn PDF document text
    • https://8-hi.dataroom.tw/upload/file/10539842566.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/fonagen.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/79170164358.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/92642858920.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/biwegep.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/kudozoz.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/sororonez.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/42172204836.pdfIn PDF document text
    • https://manenshop.com/upload/files/22722136358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=best+100+ppsspp+games+downloadPDF 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_off0000c1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B2 19192 bytes
SHA-256: 009cc00f0d3b5aae87f3efab6cf190b9c5bb3b902a1db9e80fe45aad059ec7fc
font_01_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 10856 bytes
SHA-256: 50ca3a32a051001ccdc0705fa1dc16ec4d768634652ab8fee0ea75758449ed7f
font_02_sfnt_off00010c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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