Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f08bff101b1a8be…

MALICIOUS

PDF

88.5 KB Created: 2021-08-11 12:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b1bd5a11a7922a3b613fc41a71d6002 SHA-1: ef3e84315d8e1e22de0003ca27bee89278b92202 SHA-256: 6f08bff101b1a8bef13dbe1df252a8ee6b7149dc07087cd95f0d70b1337a68f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting sites, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded links strongly indicate an attempt to lure victims to external, potentially harmful, websites.

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://synerhu.ru/uplcv?utm_term=audit+report+format+for+fy+2019-20+last+date PDF link annotation
    • http://malopolskiszlakwinny.pl/upload/File/nukidonerosozigesefafil.pdfIn PDF document text
    • http://bienbao.net/uploads/files/bodudakiberomejemaz.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffee0d7c2f---96959865611.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/kapidag.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160abd2757253f---dipavanemapibir.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210625134911.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb14f5686c---38177924977.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/n4v6cnhmi17i7bidi3ft0ut1pi/71688636181.pdfIn PDF document text
    • http://chongros.com/userData/board/file/mixoxavogomus.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/pawakare.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/17456033560.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/vutitujutomesiwo.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/zijew.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/21456648457.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9944e5d7a9---46753474057.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/88979344167.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1fffbceb668d89f878b3654a3b263801/46248836452.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/73949927922.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/varenuvosexozotela.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/92862135274.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7f9172e15---gogekitibanugujijidivomit.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c587e5ddd55---31721774472.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/zaduditi.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_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 17512 bytes
SHA-256: fa876802875cc60c70e47736f66fd137d8abc7fd5d0e5522ee0bf60c01aa9bc6
font_01_sfnt_off0001211d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211D 11248 bytes
SHA-256: 1e4dc23beda045d45f76a489721277dadd8287976c1a5b90e8d7492fc3e73011
font_02_sfnt_off00013bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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