Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d2681e9fde113d…

MALICIOUS

PDF

64.3 KB Created: 2021-08-04 00:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd29935636e0c2002b3ea6d46a7e333b SHA-1: 1dbeec9fc344cb9e2cab31e0525633d5ea61abbc SHA-256: 66d2681e9fde113d05e87a8ba143a8864d56efabe86e24c8f8b7071488896449
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9449

Heuristics 5

  • 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
  • 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://oniceh.ru/uplcv?utm_term=principales+centros+ceremoniales+toltecas PDF link annotation
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/24l251ak4tic0f8ku4bsecec7l/bivutunevutamawobuxubaso.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160892521cf80b---75684721705.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/cab630f2582a2211ebe723764151a251/zoluvapizimanamewaw.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/lidojujotilape.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/ac167671463ebfc6a925e151b68c653c/beligelululujas.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/54e91685b5b41962dc3aee0701fbcf64/27415649146.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/4352fe652ab4c9d8a4be6dbfa55a0621/98453638077.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16082066c643f1---23089269093.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/c110466be24ba8d1d1b104940f7f49fe/talulawuwepilowew.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a33fc316ed8---wipugejolumawepobaluje.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db8b17add64---29470027466.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd015801ffc---83639119524.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/93059355504.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/3ptf5vofntmpmjr9ng9o1nlnn2/vareriwumejisid.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/gatesuduroma.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///xupelogibezikanipidoxoto.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/79887021806.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66ef32eb20---7830010398.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/muvopiliwuwisames.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca15a7c3de---38980763279.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/midowiwesu.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/61388629285.pdfIn PDF document text

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