Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee6b897127dd238f…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 16:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: abbe54039bd46651f1bddd0e2517aa2c SHA-1: f7337010239af85efb2dd5faf96b98bc3e2ad39a SHA-256: ee6b897127dd238f3ffd834cce659b02da5a6815590195256571a89b4c37fa5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially malicious websites. Heuristics indicate these links are hosted on disposable or compromised domains, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://wastran.ru/uplcv?utm_term=game+apk+adult PDF link annotation
    • http://fcraregistration.com/UploadedData/file/78864183011.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/ramogakubazup.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/28106237872.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/rexadifafugamid.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/40225482991.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/wedel.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161514623c75a5---genin.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/xitesazobolakegupek.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/vojekonezufukarozorutenof.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613219dd6fa40---mametonixapexegakibivo.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/sosekaravigigep.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/527d70d21e27538bc524d2d7ad8db10e/wujutinidisemezesuxi.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/xepisimevotikilozewogopu.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/14788501673.pdfIn PDF document text
    • http://artdental.hu/editor_up/51432265629.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/mawiboximamogofuv.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490f0681bd7---38127259364.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/13834796604.pdfIn PDF document text
    • http://msiutilities.biz/documents/14383756361.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/92161643603.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/66673534355.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/dikufazokate.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/62448778032.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/towumemev.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/jaligegi.pdfIn PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20210925_82170D00EBD28B78.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_off0000b138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB138 10200 bytes
SHA-256: 6c5311cf3c4558771a5a4e4ec0ac1f3591d95fe8cf876b6682060ee6fa2af01b
font_01_sfnt_off0000c81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81F 15212 bytes
SHA-256: a76e3bf41ec31528c7f6f6a9d1dd8c34b5d32d88b031d6e444ae5eeef1eeebd6
font_02_sfnt_off0000eed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1