Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3024c94483c494a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 22:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 129954f468a32e142c2e817b98b348e4 SHA-1: 4ec26d0e8e2af4e9daf175ab0426cbd0da47be13 SHA-256: e3024c94483c494a5b54033e2b8ca66d4d9c1c13d08f4c323c101c25d7b5363d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and link farm nature of the PDF are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://wolfpackbasketballacademy.com/content_docs/10869547053.pdf In PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/kukizekebaterasirekux.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/74425267444.pdfIn PDF document text
    • http://www.siposferenc.hu/html/bobobide.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/melixaxamupadexaweken.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210902020417.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/47876208211.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/53063292806.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/dupowibozomugofifukajuso.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134a4edb984f---64313357910.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/3011369486.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109020151293127.pdfIn PDF document text
    • http://jadeite.ru/images/file/34514879890.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/1b351037e7f5a765a71b6b9e46756519/sokerajagufebefolodemibuv.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202191746189310.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/vajonixezuxigisefove.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/cfa2bd595072bda73056a2b479539736/80854504705.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/44980015789.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/mozuv.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/sumirinu.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/64885608690.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/39516228009.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2b744f433---89677455689.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/13482697896.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/e0cadd299dd00abaa5c34f9ea450bca9/bumilopuladawigifikexises.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/putiguro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=k+means+clustering+algorithm+explainedPDF 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_off0000d4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A3 19008 bytes
SHA-256: 6ec831bfec16cfa22463af6977ca3a9ef7c47295a5f265f21e509077c277f594
font_01_sfnt_off0001067f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E96 11156 bytes
SHA-256: 91655a71686459d9271415a45dcb1eea2f71e9fd85166443d15ff04ca0a4a068

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