Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd43645d6714bbf…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 21:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8cd865ea2019e5524ef432c7cc5d4c1f SHA-1: 0abb09430d996882112def4f9098bf4068026253 SHA-256: cdd43645d6714bbf20077019fe7384c78a2ef07688245653bed6faba5293b52d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://danies.ru/ckfinder/userfiles/files/30487565701.pdf In PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210623_53A7B3B08979D93D.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/26832328998.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4d613d1202d198915e015b7c0964297d/51465889114.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16244720202017.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/bovakibisujovajab.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a1788c9268---29947324686.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/49556079585.pdfIn PDF document text
    • https://marigabung.com/contents//files/72030160150.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/zesisoxadasijusel.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021613122354405.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/66383965708.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/digox.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/92630744208.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/gerefujaxutapered.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/bifenidijulisu.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2cb32ee6dd8bcfc795348f38d440c049/ronakedamigafivimanufoz.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/40962589100.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/80f7b09734ec95399447df7209121536/ragikitaje.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160887aa30d517---54451526291.pdfIn PDF document text
    • http://belloverde.net/emailer/file/bedavo.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/lekuvivar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=english+grammar+tenses+book+in+urdu+pdfPDF 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_off0000d633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD633 17600 bytes
SHA-256: c248c802e5269c0e22a365dbd6477b408df984daa528fcbe436a6dbdfddae641
font_01_sfnt_off00010411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10411 11260 bytes
SHA-256: c19bbe504cd76fd15cbe525942d94bd273865abd25c91eeaa2ab2e49ae7315d9
font_02_sfnt_off00011dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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