Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2cf4a2f5b062c73…

MALICIOUS

PDF

150.1 KB Created: 2021-08-26 11:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f26a43f1e08ebc9397dfd1967bf1dce SHA-1: 525ba75c476ddaf47ef44507e7db923519688d93 SHA-256: c2cf4a2f5b062c73974efb20c275ae23ba4790f118f550fc0d6cbba11da011a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URI heuristics and link farm detections further supports the conclusion that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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=occupational+safety+and+health+act+kenya+pdf PDF link annotation
    • http://geombiagioschettino.eu/userfiles/files/xawoxamokinefiwo.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wogodetiga.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/35604358254.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/luleraranejafa.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/adpf6uh018i3a7sf78fr8dqk01/47953855022.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/bazifopewidisifu.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/juruzi.pdfIn PDF document text
    • https://combrooncom.com/contents//files/69000317544.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/xefugum.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/77976857152.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1f1a46d9d99164c094d433c08946244d/kexuleba.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a31cfa1da8d---49618228062.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4329ee1689c48aca378f07e73165e975/15231407115.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/9459025704.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/wumov.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a47aff891e7---nenefozobekaj.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160841636ccd1b---73125641088.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210614042357_xj4ngy.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2a92eac6c---45278224798.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acec7bdfef0---82667426438.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/52928205679.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a754d127c0c---63618101600.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210807/16282834931361.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_off0001e67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E67E 19344 bytes
SHA-256: 36d0414f08525a1c5310831cb5d4c3821bec671709ec6d9b1f81918bc19b0297
font_01_sfnt_off000218ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x218CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000230e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x230E1 10948 bytes
SHA-256: dceed13d7f3e3ec6d99683e48a8dae23e35c855135460dc867e7c954e5097fdc

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