Malicious PDF — malware analysis report

Static analysis result for SHA-256 798f64a9033bada7…

MALICIOUS

PDF

84.8 KB Created: 2021-06-11 05:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e44ade1624bb4986056980adc30fd271 SHA-1: ea3579a8c1fd78c23421c35dd7c839e61f4b03cf SHA-256: 798f64a9033bada7b18d0baf67e8cc3460474f948943953204ff77f0d193c0ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing a trojan. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards the file's primary function being to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://inwebjor.ru/uplcv?utm_term=hacked+version+of+gunship+battle PDF link annotation
    • http://gift-founder.com/archive/upload/files/bowokelolakinibi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1f4aae314---zawuturaroxopenitove.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a662f2e56df---596534342.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/a1t6v3vncirb05vthvr1oh10ik/nosijijutokutu.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/af763b1abd117a31089e5993ec82f96b/buvemetir.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/xojapovibikiguvagerapuxe.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/36370333071.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5ffa3e61---54281513208.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/v6n8g8ib13cmgj4j8amr3v23bb/49594678478.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/3ffu1sdihojrohoccbncqtl9b2/8852497234.pdfIn PDF document text
    • http://feast.to/upd_file/20855724978.pdfIn PDF document text
    • http://kfbi.ru/content/file/55513526584.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ijasijazaweka.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607973694b856---xuvileka.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/16/file/20210516_172306_102.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/c6bf853303bf843b6681e4df57525c9f/24590803724.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 3072 bytes
SHA-256: 1dec195b80f12686b28f3273b38c7ad9eaafe11f8edac00ea9642b0a20e8e6c4
font_01_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 5640 bytes
SHA-256: 37493879133c0caad9073cb1985d2e5dcf6e9de82ca6d4a9ce1d658eaaa09ec4
font_02_sfnt_off000109e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 11224 bytes
SHA-256: 488619aa84ca661ba2c351832bf79aedab612f78c0e168d02e836840b557a419
font_03_sfnt_off00013092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13092 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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