Malicious PDF — malware analysis report

Static analysis result for SHA-256 908d59fd3ae44d1d…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 05:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ad5498f28d4ff105eb6e0ab1b779e63d SHA-1: 7f19ef3944388d60ded14735e1dfba862d6fb815 SHA-256: 908d59fd3ae44d1d3ed11c1e868a850896c24bd57cb0aba111c25bfaf0f4ff6a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The primary purpose appears to be redirecting users to potentially harmful content or facilitating SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tort-art.ru/userfiles/file/19992998241.pdf In PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614e72c3c9f51---temodepinimuf.pdfIn PDF document text
    • https://derfo.info/resimler/files/8578279684.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/60389947923.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/7442315115.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137236a396bc---rotiwilixeputabag.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/vefufafijixunoba.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/55420968914.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16143ba8f37b53---34511754730.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/64160672975.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9nj838lf5bu5lohcrmpiukpmf6/2049456545.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/noxujefuzukason.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/55086023097.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364e1004ce0---fovenebabefurimajuzozori.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/49ba20022691b72eec85dd5f6b25bef3/pusokus.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/75035496998.pdfIn PDF document text
    • http://premo.at/userfiles/file/48147273874.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/51954988201.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/pexatikaxaxod.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/99929253167.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/91912418745.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/surageruzit.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/79423931153.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/zaxenutukid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=traffic+game+mod+apkPDF 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_off0000b232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB232 16996 bytes
SHA-256: c71ac3b208852a42c3d0d5aaf95ba67d20c4958fac26e613017f9952847c523f
font_01_sfnt_off0000dd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 10600 bytes
SHA-256: 675c54ff7b50aa0ccf3c1f1b0d4d7ec14e276fe46824a2744550a0918a442cba
font_02_sfnt_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1