Malicious PDF — malware analysis report

Static analysis result for SHA-256 444fe3924c79e46f…

MALICIOUS

PDF

75.7 KB Created: 2021-07-06 19:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fed0f23da2baeac1c30f002c0c48d6de SHA-1: 956c85c26bc7dad2d54341a9c54179975a9efa98 SHA-256: 444fe3924c79e46f6348ba59fcc2c4c9b25cd808c8029e6909a6e6045a41d910
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document contains a link farm designed to direct users to potentially malicious websites hosted on compromised or disposable domains. The presence of multiple links on such domains, coupled with the ClamAV detection and ML classifier flagging, strongly indicates a phishing or malware distribution attempt. No scripts were extracted, but the document's structure and embedded URLs are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16090f497791f2---maxadawilolizowebepedevid.pdf
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/womevututabibuxe.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/3c1554b9056ac30da061e7ae81b58158/dilajuri.pdf
    • http://kinel-hunter.ru/upfiles/file/30323200088.pdf
    • http://www.annaleehuber.com/content_files/file/rupenimaxovavosefuteti.pdf
    • https://ewastexperts.com/userfiles/files/kimabufunepunu.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/lquij4b88sel0a1ma285rup6e5/repunalexizu.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad76a848be---risozi.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a85b026e77a---62867693293.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9757496d9---42716335652.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9693e9155d---13985232865.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57855db8d8---28404170580.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/fexelesinux.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fffdf79371---16412604014.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/pifefopigolavulepabo.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b673416c633---lalukuvise.pdf
    • https://callalilyvn.com/upload/files/nedagikowizagur.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5925ec56f---furorowa.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/e7181cdfc32400b296fcd4ee9b1e969c/32239636053.pdf
    • http://infrabud.eu/fckpliki/file/moniduno.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3a658b39a---pakexel.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c779094c6---rulojosigu.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160da9ce2d4031---bibetobine.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c965f633ab---42351749031.pdf
    • https://interior-mark.com/ckfinder/userfiles/files/92411769020.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/n2uu82l6n87la6u8hb5iep3p35/befokezezupirivadimomip.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=turn+on+the+tap
    • 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_off0000c808.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC808 16792 bytes
font_01_sfnt_off0000e01a.bin
c64cad0b266a7f334acd66a67553c7732d4d0c1065b284adcef5505e9bdc95d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 16232 bytes
font_02_sfnt_off000109c9.bin
e2487c8731582aad44343170bc57e464fdf64b36726bf5b809e537fc0e61d7d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 10108 bytes

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