Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff10c2e59767b4a1…

MALICIOUS

PDF

87.7 KB Created: 2021-06-25 12:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eeae1ccb4c6a097498e45c379ba5f43c SHA-1: 8429a5c18b2dd3c509539b027e4f04f8c3e200e8 SHA-256: ff10c2e59767b4a182490a75be69dd03e3aafd24c4ffb8635987891af896299b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classified as 'Pdf.Phishing.Trojan'. The document's purpose appears to be redirecting users to malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a8d5c4400---99570623074.pdf
    • http://maremio.ru/admin/ckfinder/userfiles/files/64023698976.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2244e8911f---67423455363.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc0b18755b---potafawoguxepumofegawamax.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb65a9d11a---87315763009.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4d4fffe45f628d00074a9dbd90afb7b8/nesidarasolexof.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/0m8ldj26q0forsk1rr3o7k4v2h/zovatufo.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/b0e15a3d9fd95fccd74c52c1db171a2f/31799261335.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/a63e8b0d9f5959cacd047e389e2bd3a8/xefosovakili.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b685731a12e31ba0e71d14a737a6c7d4/medojusosoraxatefesi.pdf
    • http://dancedynamicsla.com/clients/38740/File/89089342008.pdf
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/g33blqfb7l96denign5mr21f68/73780493548.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=national+structural+code+of+the+philippines+2010+pdf
    • 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_off0000ef01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 16792 bytes
font_01_sfnt_off00010718.bin
245525c918f9e32b33faa3906e42058fbf4b49789e27e8eb02fea086df91568c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 11088 bytes
font_02_sfnt_off000120f8.bin
53a36b286b41a8eb88cd39de763d8c0a496c295d4bf49d35884604c712b377d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 18868 bytes

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