Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28e5da6ebc7a894…

MALICIOUS

PDF

83.7 KB Created: 2021-09-12 18:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3a1d69566753d71ab1b1038fd7051cf SHA-1: b58f13cc589bb91e8b8cad056b42ba1800648711 SHA-256: d28e5da6ebc7a894196ce4b33273af5a4e65a73986588130d1079ac0a0179c68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through a link farm. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://zlato-eu.cz/upload/files/6526032932.pdf In PDF document text
    • http://elesi.eu/fichiers/files/kuzosare.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/1621018859.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/xilelate.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1fedad0bbd76d3c8913cbacb5e891e40/mexapaxen.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/e92e425716e2e5943a44dcaa7db7a53e/rasusejevokawudadepi.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/nedo50ncggupj7qahh2a4najhd/budufogonudanoxuvutepubu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d544741899---nabepabovegovazanigulufat.pdfIn PDF document text
    • http://linza-market.ru/upload/files/91310465136.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/53061202970.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/38185050121.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316d7e63278---wazewiregopagetonidep.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/94012313100.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/debogarijefemasaxoxipo.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/vopufoxunugu.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/salukiwuvo.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/90407329919.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/jozezagoxevufurivibegu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161395a189adef---10819520677.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/97601939867.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/lajipiwaku.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ie34vpkp56ddm07cthe93shbtn/13186151069.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/53396680176.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/pisatijo.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/47300827975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ppsspp+game+free+downloadPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/gamobabulokotu.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_off0000e1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 18264 bytes
SHA-256: 54331d04808f0c2fc91c648ed28bbeb92ee3da1e3ae7ed8dac25dac244320d4e
font_01_sfnt_off00011069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11069 10740 bytes
SHA-256: 84bd088ed14def8bbfc224b0f112b8216a046e92dcbe91b17a4cb37e07749265
font_02_sfnt_off000128f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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