Malicious PDF — malware analysis report

Static analysis result for SHA-256 c428a37d94a5f938…

MALICIOUS

PDF

89.2 KB Created: 2021-09-18 03:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 223caafb62bb4dd7c89b49628c16126a SHA-1: 6f9a353c3c7b95586e38e0793ed996e451031ab9 SHA-256: c428a37d94a5f938a606ba015ba2c88eef069944740b2bf5cf31c636a9fc0b54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=as+good+as+it+gets+watch+online PDF link annotation
    • http://ytbozhuo.com/upload/file/140059211800.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/katurolivamigalavej.pdfIn PDF document text
    • http://ruihuitax.com/files/file/xuzezakefijimupepomuvejo.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/48122633230.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/83758193454.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210908052242-latozidutibe.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/wewosezofaniru.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/37090372351.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/55084535000.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161412e8099df2---xidoji.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613389190338e---5096707402.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614089c529261---13888963293.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/87602123268.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/vuxakusuzuxox.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/81121595959.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/butukubawupe.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202108311737365313.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/galidobizekumonom.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/nuvamabakomifate.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/30465786374.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/vufake.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/65308569180.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/bumeraxodu.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/wizimoponarasexuxex.pdfIn PDF document text
    • http://ccsl.asia/files/19239585514.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_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 10616 bytes
SHA-256: d6e47971f2eed35a0b206d497568bcc7dc5e8a0f4d6d8834023270ce771c46b6
font_02_sfnt_off00012661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12661 18928 bytes
SHA-256: eb73b4b79739c8ffe50ff52982a4cd026798456af8d3350b593ec6c2e77d3a6e

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