Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2066278b56b8f8…

MALICIOUS

PDF

69.0 KB Created: 2021-09-29 05:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 66783cad120c6a4667d81a08064d10f5 SHA-1: 12a04f942455592815e9cd4a3b0dfccbc403c684 SHA-256: ec2066278b56b8f852f37283403e62d631b60fe6e14e9331be798abc9883fec6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=mms+file+size PDF link annotation
    • https://spvi.cn/filespath/files/20210924024430.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/65124091371.pdfIn PDF document text
    • https://demo-universal.order-pro.com/ckfinder/userfiles/files/kabovoxar.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/26275293186.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/54874430171.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/10537296163.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/tazezumuzatopusi.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/zodevovuzigokukotiwivut.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16143af046d093---pefoj.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/gikusozukuruvoxejarokux.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/xurinol.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/58b5b4085dc176754c86c54797c04cbd/nimurokevekonazovim.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/pujagofefokutasejukezo.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/82856989222.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/6m857kpjimlkvlphvt59rtnlrq/76229877717.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090704521738.pdfIn PDF document text
    • http://unseretochter.ch/images/file/vutez.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/34646241960.pdfIn PDF document text
    • http://irollee.com/userfiles/file/69786732984.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16131640637ce9---63648155509.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/kiwigamadatawuxawitaj.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/gusewin.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/pufozakuzoma.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/vivakibenag.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA41 15264 bytes
SHA-256: 5738db3f68c0cbf2409767559c41a0cc72ba1a07e32ef60c2ada9f14d9b29607
font_02_sfnt_off0000f0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 9844 bytes
SHA-256: d82d71d5b4ebd089693313209f3f28b712c58adec34d77726476ead5e74774e7