Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdf150f1e22e41e…

MALICIOUS

PDF

85.1 KB Created: 2021-06-26 08:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7b42703a018aebb9aa43a6e58457cb6 SHA-1: 069b3cfd69adf7195ea1145277524ef579dcc0f7 SHA-256: 9fdf150f1e22e41e088b56b6bb62786b1b48bc6343b62f237059050643d8c6fe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further exploitation. The document body is unreadable, but the heuristic firings clearly point to a link farm attack.

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://faresaldabbous.com/uploads/files/murefiteso.pdf
    • http://abogarestudio.com/userfiles/file/58104322421.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/23d6711d1aa304d3f6c6a38d503a1167/49564933772.pdf
    • http://daehwa.info/uploaded/file/35423302567.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738c858ce33---pamonafegafovujo.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/vck2trb2th121b1nbe3336j1r1/tilefisod.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e88ddcef5---16287385097.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24c4b94eb---42011478717.pdf
    • http://ccswcd.com/userfiles/file/42230222194.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/mfkve31spqc8bq2ntblcfc7pc4/movomavogasizabipuzituviz.pdf
    • https://sindonis.com/userfiles/file/gasoxugipikete.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1da9b7edae---37887791238.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=english+sentences+for+daily+use
    • 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_off0000eb16.bin
818d749029edbe5e1c427120a26f1a0e6eb1087e49a53d329015e3db557804e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 16832 bytes
font_01_sfnt_off000116c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C2 16792 bytes
font_02_sfnt_off00012ed9.bin
4617f9e08a471c1689fd86b99f03e1979a6b1a93c90a2282ffa22076c6c0d7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED9 10952 bytes

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