Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b854180d72162f…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 09:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4cb063496fe4ba2551463390168aa319 SHA-1: ca4a865855e49e6a60c2678f2110be25f356d723 SHA-256: 08b854180d72162fb3ee0811f8b20cd7dcaaa4ae9acf5e52fae4c7fcafc9426a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 https://frutalmente.pt/site/upload/file/83326883353.pdf In PDF document text
    • https://loyd.rs/images/file/nepuwet.pdfIn PDF document text
    • http://3asoft.vn/img/files/36297648850.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/bomuruzuvaruf.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/gubivif.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/livinopo.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/22458039699.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/mabozivarajakebup.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/kirasiwubukulalefejadumuf.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/47984627566.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d820ac99f9---setekuxufifomujeseke.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/sawikivimagijegilusakapo.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/wabukinelujinel.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/93120552611.pdfIn PDF document text
    • https://cargotavio.ru/files/file/merunujotatida.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/20292761222.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/vonopuvo.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/33821970838.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/dixuxasibobu.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/relodozavij.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/m0dgv6kmot4r264qo7knn2up44/luzogenibetidoxa.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/3502452125.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/lovetijul.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135615533367---zisuwuwerezofugodebalane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+hack+wechat+without+target+phonePDF 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_off0000e35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35D 17472 bytes
SHA-256: dfbbcf32a164bdbfe15a7f3654806280b63516185a6858e668310bf968a92075
font_01_sfnt_off00011044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 10708 bytes
SHA-256: f7040d397049b5ff5403b20c3fea6d904badfc03aa9312877944b0909ad2222f
font_02_sfnt_off000128df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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