Malicious PDF — malware analysis report

Static analysis result for SHA-256 224ecad65c3f3434…

MALICIOUS

PDF

81.6 KB Created: 2021-08-25 21:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09544ed656f2e985b6c3fb59994a94d6 SHA-1: 046b5ff54b6a38e7bf1321ac0fe131e8fd6216d2 SHA-256: 224ecad65c3f34343baa48204f0becce5108907d4c96fd8cff8443e2a6ab35fa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM firings indicates a pattern of using disposable hosting for these links, likely to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/a7f23dc76d77dbff632e63242c146ce1/nopomugiwowu.pdf
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/8139657880.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c5a864320---wasunabafopujuz.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/5aa14b422911c29f42aca8c73336f76d/67942138075.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c4fcdef1b---fenudefugolanifakowetija.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zaluxewexusuxasewumutozo.pdf
    • https://groupunsur1.com/contents//files/26124571842.pdf
    • http://kalkulacka-hypo.cz/userfiles/files/75799095167.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/pvjrbis3nua9hjgpj4fa7rqth1/definofozubedekusedukuses.pdf
    • http://svsteinfurth.de/radsportfiles/file/61116766698.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/zalisejovisuwafegi.pdf
    • http://www.anjhimayath.com/upload/file/94229184005.pdf
    • http://dashoernerboot.de/userfiles/foritawojadamegelipuratuz.pdf
    • https://am-system.eu/ckfinder/userfiles/files/67455627678.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d472523b89---rezegopuvuma.pdf
    • http://rafaelokazakov.com/file/fufujo.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607746c1a3b7a---lokosapabevovujigawoni.pdf
    • https://olterus.com/contents//files/88680092778.pdf
    • http://ackerviewguesthouse.com/userfiles/file/86646729145.pdf
    • https://kovtec.pl/eurostyl/photos/file/supotuxuxakewemafaj.pdf
    • http://plnjl.com/userfiles/files/vuxonomugevuvor.pdf
    • http://np-laser.com/upload_fck/file/2021-6-19/20210619104245998796.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+download+minecraft+free+for+windows+10
    • 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_off0000dd79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 16792 bytes
font_01_sfnt_off0000f58b.bin
78e5610ee4f175c68e7c92c96830feaab3960c221ad14f1c8036d47f407fb55d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 16200 bytes
font_02_sfnt_off00011f6c.bin
a4428a977d3c8776b73bf35e5ac94c6398b354fc0cbab687ea2e0e28093e82ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 10888 bytes