Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b79a2ed9177756d…

MALICIOUS

PDF

76.8 KB Created: 2021-09-12 13:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70ec5551286539ef2f8c1a387c971128 SHA-1: 72a142946d8588d1ead8a8eba9db86470ed87850 SHA-256: 6b79a2ed9177756dbff998324c25ec3dc01faf1b22bc2a960e63de17edb3cba4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://cualuoiskydoor.com/webroot/img/files/rokeramulevad.pdf
    • http://ap116.ru/userfiles/file/sananedevejilix.pdf
    • http://twgo8.com/uploads/base/files/202109020856169906.pdf
    • http://4bx.pl/public/file/12202732205.pdf
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/xejepemep.pdf
    • https://sproname.com/files/userfiles/files/gamurizefomelasesun.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/578270357.pdf
    • http://www.scea.edu.mn/ckfinder/userfiles/files/dagubatagekawu.pdf
    • https://vwb.mrv-educationservices.com/content_file/files/2444232041.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/lesafuvi.pdf
    • http://studioaba.net/userfiles/files/74610232180.pdf
    • http://nilesk.com/userfiles/file/48237154854.pdf
    • http://swapnakoodu.com/fck_uploads/file/53618180566.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8ep39hq0mcr697panafo8huclr/86400868563.pdf
    • http://adimhukuk.com/resimler/files/jokitobe.pdf
    • http://khaskhaan.mn/uploads/userfiles/files/90371971634.pdf
    • http://ficfart.org/userfiles/file/24571947352.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/zakozeforixujadovedasitox.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d79d5461d5---zizabojotirepifoxa.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161365182311f7---24670069071.pdf
    • https://askisan.com/upload/ckfinder/files/jerebumejesirumigiwawo.pdf
    • https://happyfun.tw/uploads/files/202109060637592628.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=modded+apk+games+for+android+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c673.bin
8c7ed6b957cd3348074fc72d129132eb98da0f49b8476ad6024a02d7b7351504		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC673 10916 bytes
font_01_sfnt_off0000df85.bin
dd0afd7be12c3183c800265d525161efefd2486e2a0cf898eae08f1fc9c6f944		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 17944 bytes
font_02_sfnt_off00010de6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE6 16792 bytes

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