Malicious PDF — malware analysis report

Static analysis result for SHA-256 761eece6d29a9076…

MALICIOUS

PDF

83.1 KB Created: 2021-06-25 15:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e3ef49214672402a6b939f884ea96b4 SHA-1: c3448e7096df0f80190028c33eea9900af258aa8 SHA-256: 761eece6d29a90761339c631599678b650255db941ed7365a5670d55025d0907
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The presence of multiple external URIs and the nature of the hosting suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nomylo.ru/uplcv?utm_term=fashion+style+in+different+countries
    • http://x04ydivan.ru/userfiles/file/tufisunamonijoduga.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4209c20fc---51373982910.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/3001b7d1ffc2e9011db231e6da84d4df/sedosukarafatagexo.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094055116560---vobekowojadu.pdf
    • http://adance0112.com/upfile/editor/file/faxopomekomij.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f88f87c75---21039944220.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/cb43c1a6e1a86f88bcf01012e529ac66/joxobuzovozexix.pdf
    • https://damiel.eu/userfiles/file/5072855325.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/86c6e4do3eljfhks1b3td54e87/45563237225.pdf
    • http://k1a.ru/images/files/file/kopiveperelow.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/witobibatabogedogazo.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abb30416734---88808525388.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/c60ae273c34ef8bf58f23ebfb2b97add/ravezoxumonixu.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ace1cd2d2a1---21989527013.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1o3m1h04i3i3clrqi5e84rdjt7/69740884287.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_off0000e1f6.bin
47e777977c799fddfb2165182ee9c2a02eaa69f25a7713a3573a5969bfea8216		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 17276 bytes
font_01_sfnt_off00010eb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB5 16792 bytes
font_02_sfnt_off000126cc.bin
3e6961ed67c86a8eb736202c184ef887c843b5562d267653acd507acaf803624		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126CC 10764 bytes

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