Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa9e80c7438c94a…

MALICIOUS

PDF

74.6 KB Created: 2021-09-10 19:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c9e9f6cb91d49f8612bd13b58f7817ec SHA-1: df41e0ab24f43fb91d97b4cd5471952b82f6dff2 SHA-256: 4fa9e80c7438c94aba66c076356d8701573eab6cd7bc991b43e0c1ffeb1e2837
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a tactic to distribute malicious links under the guise of legitimate content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=geronimo+stilton+kingdom+of+fantasy+free+pdf PDF link annotation
    • http://minhanh.com/files/56998576967.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/dawepipujedolibiv.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tomeduku.pdfIn PDF document text
    • http://mariancozma.com/_user/file/18382203726.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/lavugipov.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/fovivimilinufij.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16134f70a5b678---butedewa.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/44137284561.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/sekixoni.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/vobatopaxawopeliwuwuv.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/naxodoti.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139ff71801a2---pakebisokajelamifeb.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/10603429450.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/77188910745.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613256dde06a8---5001202663.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/99545088394.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/29eu04i2u54t7ij6i7drp4sebd/motirotaduj.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353bdbaa213---foziwenetuzukagemaf.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/kuleju.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/kifumuxutod.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d046069328b8ce968bc190fa414f760a/mezokivakuwegevilefugedal.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613516b138392---nujomewel.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/17234756578.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/46520163323.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/7384253169.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109052246126030.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/waxinowewa.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_off0000bfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 11084 bytes
SHA-256: 04857f151799ab142f452d1be517c873767c6113d75c38d32299d8ff60a8c83a
font_02_sfnt_off0000f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 16488 bytes
SHA-256: b0a385047edba71f8eede71c58c1a2c6e39c44bfb8fa47a35d250bb66ef21fc2

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