Malicious PDF — malware analysis report

Static analysis result for SHA-256 181c8eae642a40b8…

MALICIOUS

PDF

90.3 KB Created: 2021-09-20 08:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a62353a06f1175a427e645681747865 SHA-1: 84d63f734a79732444926a69f8df528d2c82fceb SHA-256: 181c8eae642a40b816625521e24b2af22367831f2266ce0cb072b37fee8e2fc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://cructi.ru/uplcv?utm_term=visa+valid+card+generator PDF link annotation
    • https://desense.eu/uploads/wysiwyg/files/lutokujosanikiw.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/8318231882.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/lojukinikepekuwan.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/38287243358.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/1e4588d7b2564c304c8705605baa28c0/sipigaziwutubipuminebo.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5330438479.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/xiniga.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/nixizirifabetunewoxonej.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/gogomonetomixolirajuwu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bc0a4bef5---kofimekoji.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/vanojotanof.pdfIn PDF document text
    • http://abc-tel.ru/data/File/pusujovelediwu.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/5101604409.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/17861986011.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/43657887540.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/17534524017.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/zogev.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427ff8e4a08---rugezerek.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/89894829246.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/17115548170.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/24280533780.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/i5c9ofg0ko2b138kdv62lcmhs2/35494027673.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/18293069303.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210915224611_gwhput.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 10580 bytes
SHA-256: 63b4e449c3f5bfa2f46ddafa0f968ef8a4c59e1f845461dd10b2918a9444a668
font_01_sfnt_off0000fd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4D 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_02_sfnt_off00011422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11422 18524 bytes
SHA-256: 8127e62eb96bed13a10f93196b8e3d8fa0b37d917945cfd66249445bb21c994a
font_03_sfnt_off000143a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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