Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf3479a7eebe3f2…

MALICIOUS

PDF

85.2 KB Created: 2021-07-02 12:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9da1d9608464c666348f3e9930c3390d SHA-1: f2d9e48bc491dacc260f57f76b5cbcc57c213dc5 SHA-256: daf3479a7eebe3f2502a6f4cab302777693c5d207569afd4bab488d04fbd731f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. This suggests the PDF is designed to redirect users to potentially malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=t+test+z+test+chi+square+test PDF link annotation
    • http://www.sport-konyv.hu/userfiles/file/28323595407.pdfIn PDF document text
    • https://www.leeja.co.uk/wp-content/plugins/super-forms/uploads/php/files/f27e21cdf3afa0b62a5a30b0fbbdf247/41522263356.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/jexebowijobalijofeka.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/69776134972.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b31062081---tajoma.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/26536165174.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/26fd9fd100cf34ce88754c2d16c3d85f/kaneladujuve.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/99067704346.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/i5nvuf1os3up73dfsqg2lifvkd/nuvogevomote.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/3c483ae2c878ed7f1dc6bb43396a9826/20924100751.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/gorefuwamika.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/bizobapusugozuwaxegalife.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/942243c6e4e66aeb4bf54ae18c1db8eb/95718193020.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d61344d2d2aabc91f472da3bc0144a34/zopiwenapi.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/12389854029.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/5f440243a34965395a2d5b6bf1a10c86/fexukajazujefuf.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/vapaj.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/6859002290.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/95912006775.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/chka22pb3hm7v7dbv5o483tps7/zujofabasebewegivibe.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160752c80dc9b8---67592654304.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/qr6q2jc63oc59tl6gipidabg74/xanixuguxumizojanavi.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4354966463---31387596508.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_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 10328 bytes
SHA-256: a44fb8b1a472bd6ca118860168485c7c753c584b86b1dc244951aa068c41cd88
font_01_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 17980 bytes
SHA-256: dca69ef79fdfcf2aa9ae87932e5f50764d949c7d37f1b502d0ecd16b2d2ab919
font_02_sfnt_off00012f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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