Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbcc4c98f8104a8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 07:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d25d4c544da7fc8e10a3fb0935315c69 SHA-1: 217a25e9ea64060197640184bc9d1835058c11a7 SHA-256: 1cbcc4c98f8104a89ea46f4bb5961530e9fb422c47f59ea16e5eb5ff5a348feb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure strongly indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7655

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://drafthe.ru/uplcv?utm_term=screen+mirroring+in+mi+android+tv PDF link annotation
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161422d21140d7---17083904090.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/58846328982.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/movujajez.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090800022782.pdfIn PDF document text
    • http://taxfreepoint.com/file/27587162119.pdfIn PDF document text
    • https://aitalk.vn/upload/files/86364829466.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/7445000065.pdfIn PDF document text
    • http://scpt.it/userfiles/files/97898153827.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/gadixofozuwedokika.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/1974463997.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/bubomap.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/50305419487.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/af1bb0b1dc85a7c71f938200ecb4f275/fexaso.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e95cb4e2f---bomesisezojizizaxi.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/30056608637.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210911_220315.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/xuxor.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/nuvevagetojugokad.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/wuxefelekojexebebibevuxe.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/87626386550.pdfIn PDF document text
    • https://blokhol.com/upload/files/tuwafatomidubefabe.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614099c7178e0---sewudurijarolelibudimon.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/golamazinubute.pdfIn 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_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 10640 bytes
SHA-256: c65869dce3e76191f6f8d6465a9865d6dd0ac1d5b8fe1127c35dc78c09031322
font_01_sfnt_off0000fdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 17936 bytes
SHA-256: 00d8ee9703ad4b6cfe7bdde17b4e7e59500025446a507c0cdf13b40a206928a3
font_02_sfnt_off00012c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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