Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36965b1f2ec4169…

MALICIOUS

PDF

93.0 KB Created: 2021-07-25 15:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 857c00f1f268789f4a97fab2e5ad4853 SHA-1: 5b30b1c55f340b56d32bbe7da1ada8eb292e65e1 SHA-256: c36965b1f2ec4169000bbbb00df2a20e29f3b89b03b2c9d87c26929d98dfa8ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160799f385b017---jarikos.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2cfa2804---1332601156.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/37305727664.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210531_4BFEE65D3B9102C8.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/392b71e4ab42a45a98fb706dbd527a69/97246681585.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/99415772977.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f007e6d3d0c---gofozokonorudokizugebi.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/dugeterifuvakununoge.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c6ade738b---kurolapa.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b4a599726---91174586994.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e942cb503ff---28659056537.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/42295041749.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/95381518968.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/xejajiravoxajeniw.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/zipusabivasodewane.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/rovidojaxokepirovo.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46559134794.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/9637242334.pdfIn PDF document text
    • https://csodamalom.hu/files/files/77892908838.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/sesegileromuzabafifuromim.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b05063bee0---lutaxaxuwemo.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/9eb8cf9f20d852d44f9c91c1f73aaa8b/wivusafebazewowomen.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/sezejap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%BC%D0%BE%D0%B4+mafia+2+dlc+%D0%B4%D1%80%D1%83%D0%B7%D1%8C%D1%8F+%D0%BD%D0%B0+%D0%B2%D1%81%D1%8E+%D0%B6%D0%B8%D0%B7%D0%BD%D1%8CPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A0 12172 bytes
SHA-256: d63d4b575f6ea7bbdc77f96fc3040d639b0c1baeb25741eab66c7d8dd3523c32
font_01_sfnt_off0000f519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2B 24020 bytes
SHA-256: e9574ed4e4974575575fc78ef66e5c9f6f45748dc75cea0ed8045ff5861f7502
font_03_sfnt_off000149fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149FC 17000 bytes
SHA-256: 17b4611d269d42ba0d6d902c36e43786d6188020989b5dfabfc08ec38c126415

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