Malicious PDF — malware analysis report

Static analysis result for SHA-256 3beb2ec89ec3b3eb…

MALICIOUS

PDF

91.2 KB Created: 2021-08-11 03:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d96525849ab7ef969bca8602df2f996 SHA-1: b025bd531e6d9ab98826040322c853390e4e93d1 SHA-256: 3beb2ec89ec3b3eb3e7f1d1eaae5b5a640eb63bc19d659bc31d78da7591dc1e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a clear intent to manipulate search results or lead users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://lamexmarket.com/uploads/files/75491767690.pdf In PDF document text
    • http://wildpflanzen-planung.de/file/84514376449.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2b946c69b15343e40799cdd9537ec36b/baxogerikoduvejulisubegi.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/82525406974.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/858e99882fde7c93e58ff6f21fd7def2/luvef.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084dfaceaee3---fevoninosazisufudokuz.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/8579ab7425017e785ddb74b51277f0c8/limamavurigu.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a5e9016d1af59951fae9f90bee6acbc8/vosuto.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/bujakidok.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/7e5vt41n258k0d9cd30a284u7p/womelolulorazobep.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/6219410996.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43af45c1f1e390071e0f8fd7e1be2cab/vedubusagojibidi.pdfIn PDF document text
    • http://judge1960reunion.com/clients/873273/File/40341684714.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/6e3824250cf4d7aa0598b7ac98a32c97/32867907535.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vawogozopazovevaveb.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5f3af367---38731013369.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e551e4811---lawelebulumiregodoremok.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/21326126830.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b33ff36aaa4---5433210899.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e5ab5321e---kavorurobogagubor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=free+online+naming+ceremony+invitation+card+templatePDF 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_off0001006e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 10848 bytes
SHA-256: 012a791228a54a00ceb575e7ae51f99154f6a92f2795775fa3fd962084f1043e
font_01_sfnt_off00011934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 17300 bytes
SHA-256: 24a1e5465999862318d19b03ffed65763fcb0099941fb49cf140e5a60f2e43a2
font_02_sfnt_off00014626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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