Malicious PDF — malware analysis report

Static analysis result for SHA-256 def38bf45661f94d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-11 05:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97a13464da057d20e01e3c637280f7b7 SHA-1: f0acb5044c3af9bf2f944a5afcf0196dc44be302 SHA-256: def38bf45661f94d62f42b61b7bd8e68a61858de384c0df5835e23c017aedb5d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=hide+pro+apk PDF link annotation
    • http://skolky.info/foto/images/file/85890051443.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/9986976189.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/030afec64cf09ab383c32336d207c5ff/vupejezeluverabixi.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/92715057769.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/86271940815.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/loreraxekalolo.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/60574383552.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/86904539998.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/tetumimupe.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/51588287324.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/fakobalimanu.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/53234073177.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fawuvibuguzanofufomaxu.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/bezawuvufekomajixije.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9b854c403---rimikuzeze.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210904040017196.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16136033aeffb4---lejironibirivak.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/kaxel.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613808f44f986---sijaborudoj.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/timotep.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/lobaxapabadevudega.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/92774892785.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_off0000da06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA06 19964 bytes
SHA-256: d01aed06a97dd7b634c89aeebf969b2254300ed3cd1b4fdc9b3885ae12264c46
font_01_sfnt_off00010ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF3 10052 bytes
SHA-256: 9c2cde482e67ef7b6b7f65b16625dff6733921ed3007fa99a36958a832370a4b
font_02_sfnt_off00012552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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