Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ca70ec8682786b…

MALICIOUS

PDF

88.5 KB Created: 2021-08-05 09:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 615fc4c41fd105ed8dd4097e35e499d7 SHA-1: 0d967fb06154032d242f5e6cdc7952a108ca82e1 SHA-256: d9ca70ec8682786b1d0e00f8f574b26873ff651ee01c904cb9fc300e3fdcc66d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external resources, many of which are hosted on compromised websites or disposable domains. The presence of these links suggests the document is designed to lure users to malicious sites, potentially for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://medvor.ru/uplcv?utm_term=ejemplo+contabilidad+administrativa+documentacion PDF link annotation
    • https://heritagecambodiatravel.com/userfiles/file/barafitonafumunu.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/80897392632.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/39739374245.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/7159340508.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609e390f4e465---sufij.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021052701024273499.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/j9jkb0637tcnk5vpvdmji9lqqp/wafinaderezixiziv.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/fafikivefakegebupo.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/12779326924.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/28897175209.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/s740f2ucihk3l4pg8ihb3bngga/vuvelowidu.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/86682816497.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/372b508f406f36676f0b5062cce8229d/jusomaxunaga.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/90040938910.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/29755256502.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8dcbed0d1b54635b2e2341ccfe36b43e/gunubozutaboxuja.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa65505df---90810648683.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/4b9bb79697416f6cb636cb41d658345f/jagik.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/22398048096.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/55675697037.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/pemaxufaxafal.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d29994d89---zomokorezax.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_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 11096 bytes
SHA-256: 55433f7be5c663e5d38d32a7a601c803eeae240b64bae4870cf4b2af04c01e61
font_01_sfnt_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 17768 bytes
SHA-256: 2f6bc50985e9fa558cd429a01c7e3aac4e8209a73201a1102cbc18b3a67a6687
font_02_sfnt_off0001395e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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