Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3ae76882b5a541…

MALICIOUS

PDF

82.2 KB Created: 2021-09-11 05:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dcb0ea79cb7bd21b26fd2fd585f35ef8 SHA-1: fd677eacba148d9fa58a82f66619f23038cfc373 SHA-256: 0c3ae76882b5a5416f90dc163c983153780a4f935993de5be19b09a02a61be91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on potentially compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://instalacje-elektryczne.net/ckfinder/userfiles/files/nigop.pdf In PDF document text
    • https://kipass.fr/userfiles/file/65091116222.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/xadevokubusire.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613573ed35be8---fupagex.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/54731049329.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/zujiwozubeso.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/dupidurev.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/1322439340.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/29606767663.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210909103100.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/88357270723.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vikirubavex.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/bidixatovuke.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613be98f2e648---fifuguruganoso.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/92375758602.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc14dbed4f---15704342558.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/menejivi.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613319d6dc5f6---ridawugofipaxizemuzoxiwu.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/tezulopez.pdfIn PDF document text
    • http://tainandentist.com/uploads/files/202109080738412249.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/jadanikusunasadud.pdfIn PDF document text
    • https://shevian.com/images/file/tawunasinukuvuk.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc796b6a99---45414057118.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/rifozax.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/dagosevuxujuve.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/75388497821.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/83801576280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=huis+clos+english+pdfPDF 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_off0000d801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD801 19708 bytes
SHA-256: d498b78026333506dcb58d1c809eaad83c45277949cf7c6d02df61a797ff4087
font_01_sfnt_off00010abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABF 10632 bytes
SHA-256: 2f4c745a8560c98a16255f10dc9ca39c71c2ddabc7a98ca6d3e9b9bd3388c1b6
font_02_sfnt_off000122af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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