Malicious PDF — malware analysis report

Static analysis result for SHA-256 323daee6c3dc4a77…

MALICIOUS

PDF

89.8 KB Created: 2021-06-10 23:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c72b2a841c5bbe1e4f466e3b37302e95 SHA-1: 46f5d5db010e252828ccc3ceb6fa87174bf7293a SHA-256: 323daee6c3dc4a77acee76c484ec6b832cce5215ba855c4c8b4359e06484517d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=50+sombras+mas+oscuras+pelicula+completa+repelis PDF link annotation
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/bf331020db59c7c44aa221d2b2510da2/furagexul.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16091c577338d2---xukimoxujat.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/jubenemomaresozafejabizu.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072860416a94---xemojoxobugigokinijonasu.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b47ceb5eb5badc06af4643086487a090/guregijanetobufole.pdfIn PDF document text
    • http://billsky.ee/files/file/zofuzemefatekekumobip.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/falimi.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607473a8700dc---jedinil.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b074b22c629---rezusegajit.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/bipesagobo.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/c3633416a9a574634cbd0d233c840c3f/geviwisopetipuxipit.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1f35e2c294162d71da98244cdae784d1/fakigipexoxo.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/40687287420.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/53080380666.pdfIn PDF document text
    • http://hyundailed.com/upload/editor/file/4644841027.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086e76e3b041---95394222587.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609433b7917c4---35971393188.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160abb8e34ecd8---mizelumotadatadikobu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB6 5388 bytes
SHA-256: cfc5cbd7b6df404c7ecdf63a2e33403ae10905bdcb9dd40f0a0465a265934ddf
font_01_sfnt_off00012eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEC 13208 bytes
SHA-256: 68163c5c244672f0c64ac26ebbe4da234d324aaf6744fa323ab370a9f3bc1b32

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