Malicious PDF — malware analysis report

Static analysis result for SHA-256 69ed1c566e6d9fa5…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 16:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf5fb058b436d39774df7fd63b758836 SHA-1: bdeca30cc811c54ab005bea4be4ca41bbe47a052 SHA-256: 69ed1c566e6d9fa599f01d3aea2dcb07c285b177a83b826ea87a4ee3ed615b3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The PDF also functions as a link farm, pointing to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://neteyes.eu/editor_up/zomawubijezexomulivi.pdf In PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/27010993651.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/35362662830.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/zagunalemobelajofebejina.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/8558672142.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145718014b6c---7655087578.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/lovidivurunugulifun.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16311093203406.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/96979772783.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/riwasasad.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/giwadivesabadabo.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/30446997806.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/badonogusetetotugop.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/9109896893.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146bbe64d3c1---44383113851.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/miviraboperodaputegep.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/3801580559.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210909062402.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/15568659126139ce0a54f8b.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/jadifutitepusa.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/84542059400.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f0a55e925---rugezesuzi.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7c090ff5a---68683779534.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/54110558648.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210924154428.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/67177227860.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/winewiwudizuxufoxo.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210908110055167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bluetooth+transfer+pc+to+androidPDF 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_off0000b4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EB 16040 bytes
SHA-256: c453e8b924e35e141418411edeb76169ba2e8c5504907d4bd07bafe6ca9ea48c
font_01_sfnt_off0000dddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F3 10872 bytes
SHA-256: a6f67488ebdb12760ab08ddf0fa46dcedeffb62f6eb057bc8393641c709dee36

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