Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ce44e3976c824cf…

MALICIOUS

PDF

94.3 KB Created: 2021-09-18 06:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 71d60717443fd6341dc6528e692e1848 SHA-1: f1fef3dd4ae80a184ea23434707954ee3fc4691f SHA-256: 0ce44e3976c824cf10560d31f51d997f993ce8116c6643f584066c55f49f03e4
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of a link farm on disposable hosting and compromised CMS uploads indicates a tactic to obscure the final destination and evade detection. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://ksmt.edu.np/assets/ckfinder/userfiles/files/96804290153.pdf In PDF document text
    • http://jan-fotografie.nl/upload/files/19188233869.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/pewokogukemini.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/zutenotinewavoropipipi.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/34418224143.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/supibojoja.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/60616741460.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/bitadebukaxizokinewepe.pdfIn PDF document text
    • http://zuche0551.com/upload/file/31446540500.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/basowiwifomazabimuwuko.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/3542329549.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137698ec8f5d---8621212691.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4e97a276---poxofetajumenovonelibamox.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/77426665382.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/dozuver.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/safasofijubixefuropo.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/62495098507.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/26142812831.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/xarok.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/fezakirapenoraki.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/42767503263.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/12289330446.pdfIn PDF document text
    • https://fobh.net/userfiles/files/bexidisunura.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f85496a43---kowarogiwetufibuma.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/fitubavozoxijigitunove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=music+player+apk+for+androidPDF 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_off000104fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FA 10816 bytes
SHA-256: 973b9960e045aaf5077ee6a3c4b71af6d074879c012552d7ca9dbced907e5807
font_01_sfnt_off00011e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E09 20252 bytes
SHA-256: 7ef925bae0dbe83248d7b533048d09a63170c7764023020431c53142f43aafb6
font_02_sfnt_off00015363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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