Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ec5c1a05c1b808…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 04:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4df8966af2879ff65d6fd13b59abf88a SHA-1: dfd306564e927affbc294ef01342143438bd6159 SHA-256: 24ec5c1a05c1b808e070b8a9eae03d518fc230ff7613e88a6a01659d9969affd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to initiate malicious actions. The file also functions as a link farm, directing users to multiple URLs hosted on compromised and disposable domains, which in turn host other PDF files. This suggests a multi-stage attack, likely for phishing or malware distribution, with the embedded JavaScript potentially downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc0fc8e63b---bawexatigebobewedewufiku.pdf In PDF document text
    • http://kassa.pl/userfiles/file/xapefu.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/tigugerosevimem.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079ef3833c08---74614824868.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/86655363137.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/luvasetoropuwisupefiju.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/20999775261.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/19705518167.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5f88881e31c4d957869b97e617b79bcb/18647064472.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/judirurutugexasi.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f3d4bd44cc10c6e128ec23da4d26921c/vudifonalafuro.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///59422797906.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/dd5cdc295436d67426cf57d30e323730/50311113430.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/bc67fde9bdc1c036081b7cc9c4e3cb35/loroworonopabi.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d97ee8bda5---faletogexaremu.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3dc4ba83c---kudebofi.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52527a516---13377749522.pdfIn PDF document text
    • https://ubranni.com/uploader/files/39834753053.pdfIn PDF document text
    • http://capital96.com/userfiles/file/musiwe.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216223646481.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5862c5e9f460a71d43bb0b2434769929/73477037056.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/rupunelikuzibuvomaw.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/91102e91912ef7834ade7917998f4d31/jemopufikezawomiwusufise.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/02d21a8981d8fd40a275d69a7ad7c8e1/47090800518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=measurement+tools+matching+worksheetPDF 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_off0000cf9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9D 10948 bytes
SHA-256: 72249642e8921d681eb5b4dd68ac08a455572d621c100497123fe394090927c3
font_01_sfnt_off0000e8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E1 18348 bytes
SHA-256: 5f37835f1675c6407aa091151c4f1282244e8892933c53647e88ee259312d922
font_02_sfnt_off0001190a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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