Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bdfe63c8806d2e…

MALICIOUS

PDF

68.7 KB Created: 2021-09-24 15:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 019f69555e8631361a87de1606bf2021 SHA-1: 9acc9ac27210b54209a3c747043483e6c00be4a9 SHA-256: c6bdfe63c8806d2eca19ec0d2a529a978318c376d48705117328a71605b1f6a7
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 hosted on compromised or disposable domains, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the linked content. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://webinaris.net/ckfinder/userfiles/publics/files/27501906418.pdf In PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/38238817222.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/juzufelososilagumejusa.pdfIn PDF document text
    • http://tobolsk.fluentrussia.ru/img/content/files/23065722258.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6c60e4678---98970877324.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/lusubirum.pdfIn PDF document text
    • https://europartner2.pl/uploads/juwafuzilojiturejolesa.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/2388513995.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/kokijanomitotedo.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d598bafaf8---21718747129.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/75806438551.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/mavomewuwoliganakax.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631996110389112989.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144662bad750---16260351534.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/86626950347.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/13367283569.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161368dfa55287---13395052876.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614572bd58210---runetegetivesafidenamino.pdfIn PDF document text
    • https://egf.tw/test2/images/file/45304258385.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/43836567668.pdfIn PDF document text
    • http://deforma.it/userfiles/files/tuvikezifal.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/74766684122.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/23955994918.pdfIn PDF document text
    • https://icbacademy.com/upload/files/kedezivamisituduwatogoboz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=clash+of+clans+cheap+gemsPDF 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_off0000afd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD5 14820 bytes
SHA-256: 720995f77a131cde30ceea839fcf6ede0e7a1b587c3de2a96b0ccd1ccd3f79cb
font_01_sfnt_off0000d4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 10668 bytes
SHA-256: 406ed20c1cecc0b1839d9e7847c737da4f981f11f352d3990f4e5116b534ebe9

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