Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc5cfd9663955dc…

MALICIOUS

PDF

97.4 KB Created: 2021-09-02 13:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f5407a7a4036de27fbd4072b1af371c2 SHA-1: 8cb684fbe8ebb4e5ff3585618c179f0aa66cd5f4 SHA-256: cdc5cfd9663955dc74712f67c8232659bd47732e6576e27f7e254b533e0e9ec1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple compromised WordPress sites, likely to host malicious files or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to lure users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e57fb3c33d64b63a92b6359319d72a3d/nakawiguvobafedomi.pdf In PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0751893d92e41ee3eb1c978e2f78533/26041021670.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4a9ca9c93f9ccc01f0b556b46c9d50fd/fawanuxilezudemejag.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/lizipesegewobut.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/49020584248.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090035600243---zuzimigiguxufopevafupope.pdfIn PDF document text
    • https://medius.sk/userfiles/file/moxefararagolaxefawa.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/79542664010.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/rurazexudijijivom.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/e6727a4d2c7bde05a8874c213571b0be/mixafepuj.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160944ead3a023---23072360518.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/gq9tf8bjjfqb925qhlf351f6qq/rigosopapulimuni.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/pikitojudujaviluf.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/58164460178.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/xakixibiwunilatuzifij.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/7b33dd8aa4380e098282c4ce7f1b8e38/91919846233.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1004aadbc---104131100.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/tuzutozuromuwoga.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/fubefimozezevujugabojuwe.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d776cd773ac---31111596312.pdfIn PDF document text
    • http://jaika.in/images/documents/files/zepazafilefotako.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/nasefabasozojeromupixonuw.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/jetexatavuboliwopan.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8c7faa33abf54584c1bfdf7d1e43f7ed/73375055681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=free+short+term+tenancy+agreement+form+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_off00011657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11657 11020 bytes
SHA-256: 565b9bd717f73f3bba28d88488078618ce8ac5aa73648809d309e0edbd2f0298
font_01_sfnt_off00012fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B6 18776 bytes
SHA-256: 43403c1a5f97bc9ecc16baa94fcada0728c51e7c119e8bce4bd63c1bb64a1136