Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df9e9c253d0a1b0…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 18:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f170367591b09a591835976933827b05 SHA-1: 373368ce35b91f3137f9d5b079bfe023cf9fafb1 SHA-256: 3df9e9c253d0a1b0ca59aac91eff2a81bbdabd4f344118e72b856f7baffde773
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=emulador+de+nintendo+64+para+tablet+android
    • http://afro-safari.com/upload/files/59118344593.pdf
    • http://mikailang.com/userfiles/file/20210911194750_1769774027.pdf
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/74400113520.pdf
    • https://podimercrm.com/img/files/rokowinew.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/v5pv7tom2rqb8p9igops49nfaf/tisobigexofibo.pdf
    • http://parateam.cz/file/dilabelefonasezobe.pdf
    • http://dreamcatcherltd.com/userfiles/file/56033813509.pdf
    • http://rapet.hu/files/62818990072.pdf
    • https://sokolzgierz.pl/web/uploads/files/97162411015.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b0d70c8a7---kolivamajumaki.pdf
    • http://teplolux72.ru/upload/file/jakotumuwafexazuxexojer.pdf
    • http://ncfc.com.tr/ckfinder/userfiles/files/19736516588.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8119ea690---figoliwafimoxudi.pdf
    • https://eetravel.net/file/wogere.pdf
    • http://thoitrangvabaoho.com/Images_upload/files/jumibapake.pdf
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/76609471440.pdf
    • http://leebyenghun.com/new/upload/board/files/mezuzatakowowodalasilejip.pdf
    • https://rainbowfurnitures.com/files/files/mijijolokafusavuvat.pdf
    • http://hotelbelleepoque.bg/userfiles/file/luxefuwukixaxesikopa.pdf
    • https://sieuthimaycafe.vn/uploads/file/61834893301.pdf
    • http://problemconsulting.com/img/download/files/raxim.pdf
    • 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_off0000e0b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 16792 bytes
font_01_sfnt_off0000f8c6.bin
9300a6f9580d42a4b109f6299c9dbe179f5e9c57186ae964ebc1e08c1b6b15ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 17780 bytes
font_02_sfnt_off000126e3.bin
c287ef88f680bfc7488e3bc47f679411cbfb82efbc8d79f862df70b5aaf03cf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126E3 10856 bytes

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