Malicious PDF — malware analysis report

Static analysis result for SHA-256 88eed2faba8624b6…

MALICIOUS

PDF

93.4 KB Created: 2021-07-06 22:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a30fb54bf63a484e8d0a81379e6d7bde SHA-1: 9cbc9febd64b0392aa06eb1b2e6ce413249bacc7 SHA-256: 88eed2faba8624b67f5eb78af0b2187014a611d9abf9ff6411df3627ce9cf754
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or trojan-like behavior. The file contains numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://crewmak.ru/uplcv?utm_term=hybridization+of+carbon+in+carbonyl+group PDF link annotation
    • http://www.alexgis.com/siteuploads/editorimg/file/xadaveliguwekadabezogo.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/minurodaluzakogilemu.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/zezinabalosiz.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d89ae0d8e9d9253b0597118dd1d4ac7d/60009025532.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/xowudiwotujulu.pdfIn PDF document text
    • http://www.asslar.de/downloads/fumufumedi.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/73546605323.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f0372fab---53164918209.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/33151830771.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/2be4d8c18ef79bb63d045541d02737eb/lodijepemu.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/fp6558ii86k7141f5efoh4vj11/reruka.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a03e2b44a06---wuwiwejeto.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f2f67f722d7d2a475466370063c4aa98/53699706756.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/6b6614f2109149ac469f5dec022d0049/50056547383.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607121c389cd7---31001947148.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/13930535751.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160896552e142b---fonowulinenoto.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/lodepedomav.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/46f34e593a4aaa8923340ecf1a7bb374/94426316641.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/c1d72dce63a8ca929bfcc307c53c3aa0/37148238080.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/34af068d55a2d72c09a7e6a18ba0db6f/jigirakarimojopitubezane.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/fuwer.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bidowewun.pdfIn PDF document text
    • 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_off00010466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 10900 bytes
SHA-256: e9cae1c0a8cbeb0d6906c8431bf5aff8877e016e9e7801fb1a17e06f398f466f
font_01_sfnt_off00011d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4A 19256 bytes
SHA-256: 4f78f32a5159dd37d3ca65661888de8e8038424bb9ccbbadaf4a34d63ba9cb1a
font_02_sfnt_off00015008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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