Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0cd3e531bfc3d43…

MALICIOUS

PDF

72.1 KB Created: 2021-09-23 18:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b836c3b5656167137a3e2d59ffa7642b SHA-1: 49f21ca01b99258594696e784d409eb26bd89bdf SHA-256: c0cd3e531bfc3d43945c6f603ad122245c7b2dfad2df4e915150047722227ea2
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of a link farm hosted on disposable domains or compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JS suggests an attempt to exploit PDF vulnerabilities or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://saksisan.com/upload/ckfinder/files/puwuxokenebapej.pdf In PDF document text
    • https://widepolymers.com/userfiles/file/31837917389.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/90407500712.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/4147086676.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/66012499483.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/48103942567.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/68320289942.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae27657359---pizikirakamut.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/96432364074.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/pesakoj.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161403b323922e---8205706797.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/bobedepafomupeje.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/riborozidejinu.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/vilolor.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614c09bd236d2---77675786575.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/955b4874579e454942594126c6beca77/nelawinopatobuputuk.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141cb84a6003---95603017572.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/4296993907.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/39651999667.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/mitomod.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/12745221069.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/kizeka.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/87953453947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mortal+kombat+2021+subtitles+englishPDF 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_off0000b63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63D 16388 bytes
SHA-256: 25ccf95799da146e4db2f0c485d847baa794ca68104afc8c266f137c8df7fef3
font_01_sfnt_off0000e0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DA 11172 bytes
SHA-256: 477db37e233704a070682f5a00a0e2694b87aa9f02592780ae90f015fd5c5b42
font_02_sfnt_off0000fae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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