Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a833dc164f0168…

MALICIOUS

PDF

83.3 KB Created: 2021-09-08 14:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1ddbf56c176fe729bd0bcb09dca72fd SHA-1: 5ae6694d24b9c37ad5ef0c1eda04f8838da9aee8 SHA-256: 03a833dc164f0168303a94f597dba23a2f7c7fdb69a02db5db4f9d39f994e55c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, many of which point to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://karaari.leaddeehub.com/userfiles/files/27312176838.pdf In PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/7653592393.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/18085480108.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210905_D56DA822AB7594EE.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/denomitogatina.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/74737299064.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb936e390---28711153559.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/vewemif.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/73325599007.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/31235646820.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/telalanogexatis.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/vuxivadixizuz.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/49755474529.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/xarejetejefu.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/17859379826.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/suvofoja.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/12829150736.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/vejezezetamavubolomak.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/vekaligidoxena.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307357612ae---43423449619.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210903043146127.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/7a309f8e353ec56b8d172a8d360de4a7/57286747605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=agatha+christie+ten+little+negro+pdfPDF 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_off0000dffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFC 10880 bytes
SHA-256: 241652972d4730c363b9717bf58756185ee495d901e98935855ec3519f83d87d
font_01_sfnt_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 17876 bytes
SHA-256: 7a73f1802fca8a30b34d2fe76b13b6a9aa0f58262babfc0279556b7770e293b2
font_02_sfnt_off00012751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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