Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ca8b27dd52230a…

MALICIOUS

PDF

78.5 KB Created: 2021-09-18 22:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 14c0fc0c5e37ad71e123baab9cab1ea6 SHA-1: 7b986470e3da56d1d8bb693430d089d5136b37f3 SHA-256: d5ca8b27dd52230a8e405ab03886a221353ffba77db531f1c431cc02ac17e889
156 Risk Score

Malware Insights

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

This PDF file was detected by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://chcial.ru/uplcv?utm_term=dragon+ball+z+buu%27s+fury+mod+apk PDF link annotation
    • https://luiginoiobbi.com/userfiles/file/92323617115.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/519745197.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/35304396446.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1505cc0d0---87300574610.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e61afc4c7de0b3cc5112b934becb656c/dozubipiwijabexupoz.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/95910392414.pdfIn PDF document text
    • http://kes.org/upload/editor/files/kogefadamatesolozup.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/11976969737.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/lotojulodubukobamoripe.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/65011858829.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/69109854216.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16136c5445b2fb---bezozuxozusamiros.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/mumeforaki.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/23342492063.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/48567850484.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/17938106037.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/kulutanamesepubapowiz.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/vupizog.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/pikofemutogu.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8e6d8be3e---51713435200.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/4122863912.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/77713280762.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/dugebajuzafe.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_off0000cc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC11 18052 bytes
SHA-256: 7b7615e23bfc05b47b2e68d509c85d0ae136ca98491740ee6672db6eac4cac92
font_01_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 11060 bytes
SHA-256: 1b63598187bb91afade5c79ea2762d6861f3e507d1da9ff7a60b7c986a6de0c9
font_02_sfnt_off00011440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1