Malicious PDF — malware analysis report

Static analysis result for SHA-256 4169242f812de017…

MALICIOUS

PDF

74.0 KB Created: 2021-09-05 04:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8bec1a9ba38806d4ca76527fa935e300 SHA-1: 6af375290613e62f899dc6f2d7042e4ea6101a18 SHA-256: 4169242f812de01795b2c0c439150bee82dbac43f389c0d97b28240fffde46cc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://riggi.ru/userfiles/file/46074795501.pdf In PDF document text
    • http://gruppocaminiti.it/userfiles/files/zebusukixuseli.pdfIn PDF document text
    • http://foxadv.net/file/80911197548.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/tujagonigu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd79e13fb8---71699754220.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/21145217688.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/89251793002.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/99262645107.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/77464102447.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/wutar.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e475fdb13e514b27f2d073d967110a33/sefepodapebuganusarik.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a4a0ef3b40d0178de7fe01dd832f019b/66809635306.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079b049da6bb---ratetanabaguzisezutugudut.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/038cde51fb48a41bd60c622f15085df7/junemukujin.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/8163925877.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/bodixilux.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/volozataxiwikolobumej.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/xadevidib.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161233e4bf2839---kotixuge.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609950e8bd57c---volafilajadufozuvulak.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/frmsnhd4umfo9vhvbmbtk2ph98/xugapegeganopusodu.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/muluwuf.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/58213498498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=bizerba+gsp+h33+parts+manualPDF 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_off0000bdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 11104 bytes
SHA-256: 0146f193f93d019d77303f344b6353f70b55fffb244f8d70d73c8e37676bdfc6
font_02_sfnt_off0000ef63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 16888 bytes
SHA-256: c5748f24a6d2636bde35f99854b616b0ddcfe46e2826e1604a7c29c02ff54c42

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