Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebdd78193362ed22…

MALICIOUS

PDF

73.6 KB Created: 2021-09-19 06:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 26a7259be9ed9e372c19dfcb007681ab SHA-1: 24a71399dcae91d0cfd149fb32951729f99f08c4 SHA-256: ebdd78193362ed22e3960cdc8f02f7d0666525190a5a4994c1e0ef642bdb67f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=issue+meaning+in+malayalam PDF link annotation
    • http://twilaw.com/files/files/nifawokufob.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/kegudenatigagidexujur.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109101519197666.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/86246893176.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/pazusaguvilisugijenulab.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/benumamixonigumuvobumaza.pdfIn PDF document text
    • http://orlickachata.cz/files/files/71301454907.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/29835472443.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/20762895874.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161407a3374bc6---vazilegakizesiti.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/48702423261.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/9113427848.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/98131416600.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/gapodat.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/gabedamanodizusoguwodesiw.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/9g5gi5ofh8oacu80t3gackugs0/58603596973.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/82402293719.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/40974784642.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/naravelupogufikepevowoto.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/wisufixozewan.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/12032617924.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/48fa92fb32869a703fdc3f3991349894/36744298239.pdfIn PDF document text
    • http://live-net.it/file/nawupatokidazogebuvoxav.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_off0000b90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90E 10296 bytes
SHA-256: 79945f9bc54c2d970577abdbefb455e72f760d473bebff9094c12652ead3f7c0
font_01_sfnt_off0000d035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 18848 bytes
SHA-256: 1508626c4da5291af44a16f33f89388984f717a11db6327c535adb7d971fedfd