Malicious PDF — malware analysis report

Static analysis result for SHA-256 729a16f6ed7ef02f…

MALICIOUS

PDF

85.9 KB Created: 2021-09-17 05:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef27b2a66895b8844cd850a93ce96966 SHA-1: 19f209b33986b004d6c9ac79da685a51d0ecbb75 SHA-256: 729a16f6ed7ef02f3133070290efa231f38d535d4a0ea802b59456dc85f2c92f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfa9c98e7e---51343875664.pdf In PDF document text
    • https://buzascsaba.hu/userFiles/file/lokanebofi.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/tebixas.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/zovazazares.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/pefazimuf.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/59458291719.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/66274008893.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/xibutoreguk.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/borezogafovumosufixasituw.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/52675195227.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/82021338853.pdfIn PDF document text
    • http://bienbao.net/uploads/files/mifitum.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/95564679067.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/7967130b544e4148f4c27976402de7da/57482485649.pdfIn PDF document text
    • https://go2germany.ru/files/file/99765764373.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c81a4c52d---92620237003.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16143fdf352309---82692315719.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/24432782513.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3b8ad190---sadeweridi.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/18597507131.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/duxajinogafugi.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/44349634719.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/84639258837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=samsung+vs+lenovo+smartphonePDF 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_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 10848 bytes
SHA-256: 92ce7ad4dc96e72c965c9930560aec5c5d571f3d5842be836880c8121c4eab71
font_01_sfnt_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11898 18664 bytes
SHA-256: 7987a3585f75e207dd15312e07904871b156cf234128ebfe27cdb9155872fafe

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