Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d4ca3abff0c605…

MALICIOUS

PDF

101.5 KB Created: 2021-07-03 12:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1b4bd6e6c3c0645bdeaa411feca071c8 SHA-1: abdc6708f9b465d170d3d29cd90c035874c696ee SHA-256: 17d4ca3abff0c605e7640d2a861869a57e110acd8b8db4d0444e3aa354898339
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF acts as a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dzstock.com/Upfiles/file/padawevulapamorekipitute.pdf In PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/c2e0d16bf05cd8e4cdc99e7c64f9a91f/14110811126.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/xijaxilalapefubevozu.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/55183702576.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/b6bc9ad10c5f25ccec3d9bdf59a0df5e/19153553983.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa947937175---towodegig.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c51508485a---21531764379.pdfIn PDF document text
    • http://poorclarescork.ie/images/75835611545.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/9485959004.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903384214d4---goxak.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/63788667120.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/scjvgvtrrfd4nobm504uu72ccu/36729153320.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/44877177084.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/ad3ffc8d851b710ea115f2a9255e56fc/pivires.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/dbo5q1j7idekd2v0gvqqlcho75/fosolumuzutozarunowumuwe.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785f714650c---direteretemifad.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/88935026181.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a83c8b742---robisabadodeb.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/wuxulelukotigolinezibosi.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/07smfdc4rangerl09it98nan3c/41105370298.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/16630684350.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ceac6eb51---vapidumijotusab.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608726ecd37e8---9842772481.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/51231524992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=3+months+in+a+rowPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11445 10356 bytes
SHA-256: af91f82209292024d16a6b2a521fc54d31a7df10f8af4aea797c7b39e40c67f1
font_01_sfnt_off00012b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B75 16424 bytes
SHA-256: 1f8cd82eaf1ff24be72f7b3ac6bc0d5b2df2e311a7d54323073c2495eecdff5b
font_02_sfnt_off000141ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FF 17156 bytes
SHA-256: 2ea4903fe8da0019ca41e56aa06b7213856c13f57bcede467f252b9a29b2fef5
font_03_sfnt_off00016ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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