Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d6f699c50351c3…

MALICIOUS

PDF

80.2 KB Created: 2021-09-02 04:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee9a30891ce8bc3c855e57dc62920487 SHA-1: 9e68782ee526603c51ac999077b7b174f25b51a8 SHA-256: b5d6f699c50351c3a7c7e22b98a45c67d35098cbc42e9b5ee2993859b96f0963
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for SEO manipulation or to distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cr2tek.com/userfiles/Proj_Name//files/76887739568.pdf In PDF document text
    • http://teerosy.com/ipp/images/uploads/files/4145406546.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/bivasefoworizemuzurixek.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/93585082216.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809f1a6e205---mudojibawedufusimita.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/xirazuge.pdfIn PDF document text
    • http://huefpdf.org/upload/file/18514834622.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/30d51c40c0ebb613ef4f3f51b67b1bdf/14980209053.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d49c0308c24---kujisupisobakomenogamefop.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/251500671.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/ncu4qgjel358bd3n5sj7pe8k2k/fabamoguz.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/73085979758.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24ca8e3674---48991917493.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/398e839b7854cac08ddf0b6eb767f6d7/tikozos.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/49948583684.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e461c94e9f40dd9c753fe96685ddc555/zutopesobivaz.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/63165555338.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/xipejarofojupakuwaboxo.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/wixejigibiwajefogapu.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607078eb2f17a---kujopifuxetelibotepur.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/97715215810.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/gusimijetubexegatum.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/79454389872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cognitive+based+learningPDF 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_off0000d338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD338 18004 bytes
SHA-256: 5178c0e6aeb76a5bbe5cabee0abc40891e61de1b2849564a56ffc8b4c5216a37
font_01_sfnt_off0001021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 10660 bytes
SHA-256: dffc6eccf7a143f64eee33102a1f38f8127af3f72b239607d295f4054fe39f63
font_02_sfnt_off00011a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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