Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64688e542eb022d…

MALICIOUS

PDF

87.6 KB Created: 2021-09-01 10:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b39ef7bba21d0a29e1148ff9713da354 SHA-1: e6dd513a2ebd5ccc54baedadfc695ac8a3f1de4e SHA-256: a64688e542eb022ddd4e1b3db585fa956bbbe780b602b52031bf8f167d3d3f6a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external PDF files hosted on various domains, many of which appear to be disposable or compromised CMS uploads. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, aligning with a phishing or trojan delivery pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://oilmachineydy.com/d/files/51804907783.pdf
    • http://www.lnk-creation.fr/upload/file/kijugop.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1edf8617328d4d433f90f567c493948f/35331382128.pdf
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/pikorew.pdf
    • http://trovas.com/userimages/xuvaravadi.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/1969123cf0e2f6e1ae31a53fc6aeabb7/68159157900.pdf
    • https://smgbid.com/ckfinder_userfiles/files/sazufudalo.pdf
    • http://gpsputhuppally.com/userfiles/file/tipova.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d9890f090604574cb8203e3adb1c5896/lofivalexusegiwu.pdf
    • http://gespk.com/userfiles/file/9420295884.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/tigudumozaxesori.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16108d02e7246b---45584530356.pdf
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/mejotamujoxefar.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e6e0ba522---pasev.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9baee4665---povilisubomilado.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2808b38de---78493762325.pdf
    • https://sofupingame.com/calisma2/files/uploads/75246945228.pdf
    • http://hawks79.com/clients/85064/File/60685907689.pdf
    • http://ros.by/ckfinder/userfiles/files/zazamijafatabuxebux.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb279d0ad---maguribib.pdf
    • http://wpscrm.in/uploaded_files/userfiles/files/tufumepoj.pdf
    • http://meble-tk.pl/userfiles/file/32472008418.pdf
    • https://ystechpro.com/nbloom/fckuploads/file/52053943437.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=offering+in+church+meaning
    • 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_off0000ee0c.bin
b36a15a406b5778fb64f1780fec5a0690b4acef3c9392a86dd72b81abba611fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 10476 bytes
font_01_sfnt_off000105aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 16792 bytes
font_02_sfnt_off00011dbc.bin
eb882fa3495fd442de39ce90b13a3b5fefa1027dc59baaf3fd77bec6cf8701ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBC 19684 bytes