Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5966b0eeb75681…

MALICIOUS

PDF

78.9 KB Created: 2021-06-27 21:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a9ea551b57be1f25d68dd2c4e2a51f6 SHA-1: 42c50eaca560a265e1ec1cb05e40d42c38378842 SHA-256: bf5966b0eeb756814a3d83c8d5b89315156a613cf81fed26c79da8e16f4a5ab6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple external URIs and link farm characteristics indicates a likely spearphishing attachment used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/39d1b6ac5c48d2cb4bccce90c525855a/25327115055.pdf
    • https://bistakalikotenetwork.com/userfiles/file/zamurolabidazi.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57c5d34ee3---ribimum.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c122c3c5c75---11647580988.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1a45903a54ff39815bdcf5b97b01b674/37252919461.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ond5un2s1a0po2c26l167255s9/xadusati.pdf
    • https://synodradomski.pl/userfiles/file/derupujimedunuzi.pdf
    • https://aulacvn.com/upload/fck/file/11313892705.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a487f6c0678---zalevisusavekuriraj.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b117972ba---15658191850.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7441ba1b50---zesala.pdf
    • https://folklorebridge.eu/uploads/pictures/files/60102073872.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/957fda615e2bbc357d2031976f490acb/23270337106.pdf
    • http://schokobrunnen.com/idata/naberukaxikid.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/674ca502c7a3e703c88bdec4c56a4332/tetarimofu.pdf
    • http://mgocsm.in/userfiles/file/96707734331.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160905e8f650ee---fufulezizokilugekupe.pdf
    • http://softwarefactory.nl/images/file/3972731519.pdf
    • http://domeinbeverdonk.be/assets/files/file/jiromoxubimokugame.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/a795849df0ad53e659e6d393d0d0bd7d/zemoxopizabakalatitexo.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/22q7vla0vkk906u1glvg0sr7d0/xabazupojafef.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16091546cd76be---sefosaririfafitiv.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b408a889f16---82304028328.pdf
    • http://ngor2-3.com/file_media/file_image/file/17049563084.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073952ba5717---35684931971.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=excel+conditional+formatting+formula+multiple+conditions
    • 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_off0000d028.bin
cb563cf3e188ea1d55fc37a5c95451db6027fabf8d6321cd92baeace29f3ce97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD028 16688 bytes
font_01_sfnt_off0000fbb2.bin
de29cd4d94136a2d02c4462bb768853e717877e2fee5df814b7ee828c2305516		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 11148 bytes
font_02_sfnt_off00011590.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11590 16792 bytes

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