Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9a567ff6636f44…

MALICIOUS

PDF

77.5 KB Created: 2021-06-18 15:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36f54dd2ca8f218f6642e78158b44897 SHA-1: 005663c4ca5e969b6bc57e0db642289d92cac231 SHA-256: 7d9a567ff6636f449ca74be13a1c5f7e1076e70d89d54a1d9863c87cc1c83f11
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/921a5b4049fe8750d9c33d6c72862026/45118966726.pdf
    • http://wang023spa.com/userfiles/202106file/2021061518440170554.pdf
    • https://jordan.si/dokumenti/file/70760057868.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6742a4aebc61eaf7d21893693abb99a5/rebarezekepitoz.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607455515c25a---sutogowaselulilosupap.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/d165b5d44a7fb37b1ad31ed99b6e9e61/26591612963.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/abb44eb99f4706875cc3bf98eef4b8bc/zedukowuxusapakaf.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/81iiimmohu60v6pd17phppiqms/difogufemozopad.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867f064d56a---28098150710.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2ab8ae263---lepomajafekivuvagagu.pdf
    • http://writtenmail.com/upload_images/file/24854453766.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b69cce28294---92288816082.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ttu3qiub91as4dh9ficai4ibds/lafazidibimuzuzemiwabuj.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160832e7ec1a43---63053158342.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gameloop+pubg+system+requirements
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df29.bin
939ce0447f02dc17c31156bd1b877501ad0c1d64bd020ea8cc115248a0aba94a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 5420 bytes
font_01_sfnt_off0000f189.bin
4053bd90ded5ca92c2b2320f380de7ccadb35bb942320c923559cc7282dd3b69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 11648 bytes
font_02_sfnt_off0001190b.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 4324 bytes

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