Malicious PDF — malware analysis report

Static analysis result for SHA-256 96358b491dee7b05…

MALICIOUS

PDF

76.7 KB Created: 2021-07-28 03:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fecc74e6f1e72525e2193e69bca35595 SHA-1: 44797b775f242d2fe029b8a05f1ff5195873545e SHA-256: 96358b491dee7b053a9a5e05ff9c62dd382210ea2aa4a8c848e87aef8da59b21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malware or lead users to phishing sites. No scripts were extracted, but the presence of external URIs and compromised CMS uploads indicates a likely intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076df777f07c---16783454662.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d70d29618e---virefisakivozogivonemekaj.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/4sjv682k00uu68lsakhss3r8m8/18037718764.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a96ed14821db8d6db31aacf716cbb19d/kakujejowu.pdf
    • http://mjacz.cz/soubory/files/35055591724.pdf
    • https://xo-sound.ru/userfiles/file/35982733337.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/snadcmgrjgpmjpr1k3f9ebmqg9/jumawiginekepaturuxodof.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160915f1428d3c---gulosakidozidorabudaduzeb.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/382a72c3e777a85d0a85547b88704d41/68078674887.pdf
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/ripajikorudabumafa.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6f0768ef8---15175584996.pdf
    • http://www.victoriousintl.com/new/resource/files/bemosevivoxolepategofe.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/pb84mqhmt0uetdcjb39n14ohr9/24443603610.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac27f88970---29693326147.pdf
    • http://domholidays.com/userfiles/file/tutiguxobetetini.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/3204829c7bd3d1ae83e0e39bd1c74778/71799225769.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8769df0c5c---godijer.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e45e7e1e6---pakoneruten.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a08ff463261---veriduzip.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/1g89vh132r14njmv7vos2apd61/fefokilifosifizalima.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ccb6cf565---fusixax.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8984f5d0d1b416603b17cd5309709f7b/jumixonazeduvakikaf.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608339072d39d---31469944616.pdf
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/o2kcvfpqolfcl92n11r53pepbb/movufuzujubesububuxefid.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=shape+slicer+3d+level+275+walkthrough
    • 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_off0000c7fd.bin
b7419e5dc92fb9c43634c859a2732a1c5e52baadd2f8f3cdcc05d82b4aa4ec2d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FD 11584 bytes
font_01_sfnt_off0000e3a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 16792 bytes
font_02_sfnt_off0000fbb8.bin
b2780790737dea74089991f000c4bb2732286256ffc4048e9412ba43c470e684
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 15936 bytes