Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ce1dcf625aafe9…

MALICIOUS

PDF

76.6 KB Created: 2021-09-21 03:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f10028a438f93d3c48ac76ad853d08d SHA-1: 968e4758fe05b59a9ef4ed3b8a1e7fe2e21393d8 SHA-256: 21ce1dcf625aafe99177b60c65249de15cdf58f321ea8bcb246e15f59f7c66f2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to lure users to malicious destinations. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous URLs suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=foundation+science+physics+for+class+9+hc+verma+solutions+pdf
    • http://orderkiwicafe.com/uploads/files/79512552752.pdf
    • http://futimisdev.com/userfiles/file/63132834725.pdf
    • https://familienbilstrup.dk/userfiles/file/44340435219.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca808b127---mupidirix.pdf
    • http://aczelzalog.hu/tmp/42595894848.pdf
    • http://jedzenie365.pl/ckfinder/userfiles/files/mubagirawedexelalu.pdf
    • https://iveducentar.com/uploads/assets/file/nepofu.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3f25f2286---13214650171.pdf
    • http://mnarch.it/userfiles/files/66870791962.pdf
    • http://bajkolandia-leszno.pl/userfiles/file/pokisove.pdf
    • http://ilovechardonnayhills.com/userimages/fuvisumurivudupu.pdf
    • https://laser123.com/geektic/files/punar.pdf
    • http://laconchigliacasevacanze.it/userfiles/files/86597033015.pdf
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/fakewosemegonirope.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144f3fe4c1e5---gibuwenez.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e91ce2c005---71679575913.pdf
    • http://safeabortionnepal.com/userfiles/file/duzurazimit.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/76778454725.pdf
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/midupemit.pdf
    • http://mateuszkucharski.pl/admin/file/weviluvosa.pdf
    • http://abwingsjanaf.com/uploads/files/nasugolowux.pdf
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/45217897597.pdf
    • http://acsalma.hu/userfiles/files/lopid.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_off0000c528.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC528 16792 bytes
font_01_sfnt_off0000dd3a.bin
5065921011edada51f352dd5e6536bd92c94b7e9e73879104cd6284fe38165d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 17228 bytes
font_02_sfnt_off000109c1.bin
37ca3fef53bdd5c3c58bab3fd89fb435822b36ed58327f69d9c86d017c18f6d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 11312 bytes

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