Malicious PDF — malware analysis report

Static analysis result for SHA-256 3183247006f85dc7…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 11:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 680ba4b66b48006cbeda72485ee8a5cb SHA-1: 7be8e95d44f0e66fa7a9319ea0de2bd652d66fab SHA-256: 3183247006f85dc72a5f5b00c4485dad75954d2a9a50b25b11edf7d65b0980f3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, many of which point to compromised websites or link farms, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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://kipass.fr/userfiles/file/26400604088.pdf In PDF document text
    • http://exmar.it/foto_fck/file/kesowabikivolotoxuzix.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/87634427579.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/sibedowaviwogutarev.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c719f486e32---4847447631.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/49797727102.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/70670089862.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/xirajuxovuwo.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210717_BFCD929BACFF15FD.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/usj9h808buqih1oi7eu9orl454/63959954916.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/ji21crbpfnvg7mb2lc9lhpfp1g/mobakogajelororawis.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/81587503210.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/217897a4be5011082cd7e76d4c288112/79266011190.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/7af079do4a6f4k95o1relpccb0/26278175489.pdfIn PDF document text
    • http://kbchina.de/upload/gubeverolexezakot.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/fgadvkjhjei6l748mf77vo4dko/58348499130.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/72050681630.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/falifatovala.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/83014446051.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/vuxagubo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff892a846c---99606593634.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981c1282198---tomigivumob.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c47d8ec8165---77294296745.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b4ad3b536---17698704210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=patient+bill+of+rights+and+responsibilities+pdfPDF 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_off0000d3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 16188 bytes
SHA-256: 1fab90b8d8f89da04c66a59abfe16ba7c06cc11582156c49d2180b798ea4de2b
font_02_sfnt_off00011577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11577 10920 bytes
SHA-256: deacfcf17ac9ca61fabbc4a89e69f3880f4e5d6951f3d4b785f221cfdd711242