Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da993887964f198…

MALICIOUS

PDF

68.1 KB Created: 2021-09-27 02:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c83e6c7870b2ada74071c9322ef773d SHA-1: 53a348358a8ca9b291c453f0f723b1ce3c3cd9fd SHA-256: 2da993887964f19861fa17178ed34e5185cdb50f485eab9d9e379befaec0e4c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/viwutike.pdf
    • http://zatuchlina.cz/upload/file/87013904167.pdf
    • http://www.cottagegrad.ru/files/file/5459401247.pdf
    • http://innotack.com/userfiles/file/jumiwabubijekasiza.pdf
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94103880676.pdf
    • http://kkc1.org/htdocs/cljr/data/files/98127245370.pdf
    • https://mancomunidadvaldizarbe.com/userfiles/files/bugufulagixoju.pdf
    • http://xiangzhuan.tw/upload/files/16407882909.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c05f654513---53729035530.pdf
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/54619213190.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1669284a0---zuwuwune.pdf
    • https://thehouseconcert.com/ckfinder/userfiles/files/wokasirar.pdf
    • http://winterwonderlandzundert.nl/uploadimages/files/vewikikesiforetofoxilezi.pdf
    • http://dokumsuzgec.com/userfiles/files/pejopopimiketifaminora.pdf
    • http://agriturismolionsfarm.it/userfiles/files/siforefiguzis.pdf
    • http://www.astmalek.cz/obrazky/file/xekoviwulexipozapiz.pdf
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/padasuwa.pdf
    • http://jcnjl.com/userfiles/files/17609923104.pdf
    • https://moyaexpresss.com/ckfinder/userfiles/files/gusokizudilajez.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc0fe908b1---dedenu.pdf
    • https://sooryasales.com/uploads/file/xuxiwojopu.pdf
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/89899060955.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=aplikasi+layout+video
    • 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_off0000ae2f.bin
1b269fb7b65e68995cc7f4dc085fad28eb39b0c0c1c6e81ac6417f19b75dc81b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE2F 14576 bytes
font_01_sfnt_off0000d2ad.bin
ca223d0bbac3b6c09a2169883e9eb353ec3cdc82e91e9a0af1839204276b7dc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AD 10536 bytes
font_02_sfnt_off0000eae9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 16792 bytes

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