Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfbd7bfdcfa4e00…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 02:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 948a38fc408b22e4c05f74bc5411031d SHA-1: 3b7a6f7b254b8702428de119d9abc20f6b95f6ee SHA-256: 6cfbd7bfdcfa4e007dc68780036d5e46d20c68ade4fc47963d2e9f599f5034bf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, so the primary attack vector appears to be the redirection to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391b38b8365---kiwijirutuxubixo.pdf In PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/fizapisuxunuluvow.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f61b736d06662bdcd2fe7498af65f867/9551370250.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/bojogekatuxoxaforupaw.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210917_93D8F451AB237EB3.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/46408903601.pdfIn PDF document text
    • https://anjingliar.com/contents/files/wasigepexo.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/10145012479.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/74629722232.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/69334171359.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/fujipexi.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/durulagegejesunor.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/41743652125.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/posujojogose.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/80404360287.pdfIn PDF document text
    • https://basisangka.com/contents/files/52037455357.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/16695751021.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613116e30b614---nugesu.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/84881545665.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa83b51b58---rupivozudapaxa.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a3aa71a99---visubosapuzinitipipa.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/32641446666.pdfIn PDF document text
    • http://guchen.ru/d/files/89119081237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+speed+up+my+android+internet+connectionPDF link annotation
    • 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_off0000bef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF7 17288 bytes
SHA-256: 98bc0423fb079ac9e95d11d8449a356c0e7687e770dcdf6477bad0a4894c3337
font_01_sfnt_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 10920 bytes
SHA-256: 58dd6723c0becc1dd6e1e187d76d7b1509108528b583ec8a5af448fde88e34c6