Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc6731e1e66b72a…

MALICIOUS

PDF

75.3 KB Created: 2021-06-25 15:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30f9830bf3c84cfaf4fec355af7a8fc8 SHA-1: 7839a49018667fe6b74b7ba6d0572ee370a28552 SHA-256: 3fc6731e1e66b72a77110dd71014d12053a5ca1d9f80aa34a2c728a8bc78d4df
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute phishing content or malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://oniceh.ru/uplcv?utm_term=downriver+heart+and+vascular
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/bf8f202c820ac6e39e5be7cebae42aa2/kofubajozirig.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/u7g3bfn18eoko4gif5ntiqf62c/divobuzo.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160823ea449482---22389948483.pdf
    • https://cornerstonelaw.eu/userfiles//file/25796807884.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f72e62650e---pavuke.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079f43650fb1---sululunogobovimozog.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076143674335---47398481025.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160700f8d3ed18---58601773884.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf59ba72481---88212139261.pdf
    • http://flexa.cz/docs/file/15958404224.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/cf7ceae765cc0ee15cd6f2cb5777b687/namufiwenebewaduwurinuba.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c00e761c2d1---28531534120.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b55bc7e7a1c---ronimetimaminoxosogexe.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f5564f6b171aa3ee08bb7180249a4921/xezimirupavogusedot.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ul38j6jd7t4mr8phppsvhe4fh3/33488775458.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c57440541d8---wefozinijaburivadasikezu.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_off0000c321.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC321 16792 bytes
font_01_sfnt_off0000db33.bin
33828b3234b943c867ecc089bc15056018651c1a0890e51209cca46aaeb614a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB33 17196 bytes
font_02_sfnt_off000107fe.bin
17dfb6ed3974491bd3b3420f435f3f7439df83cbf18f16c84e1326d565453ba2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107FE 10720 bytes

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