Malicious PDF — malware analysis report

Static analysis result for SHA-256 855aedc28a9c27cf…

MALICIOUS

PDF

48.0 KB Created: 2021-09-07 20:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82c0e3cdc8d3529a3a11d6c84ab2ea7b SHA-1: 32de1e2ee6dc95019876845d6e768f8b6b833022 SHA-256: 855aedc28a9c27cfeb7e57b30bfed7dd6ed09b3b5f1003605cc67f30649adfd7
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and is identified as a link farm pointing to potentially compromised WordPress upload storage and other disposable hosting. This suggests the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7298

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.
  • 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
  • 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://rainbowcaterers.in/userfiles/file/zedobugududozip.pdf In PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/82919769462.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/jas90ht0j4fo9368kjtrbt7l80/negijo.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b72bdd2f42---rinegebaxolunezewaretug.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b32f3c446b4---tiratonovamurujinegi.pdfIn PDF document text
    • https://dintek.eu/uploads/file/96071340470.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/68306552319.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/zakawume.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/osepajlmandnhop7r1l2tu1a13/35060990328.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/zisagiditidifimatup.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e584f6e70affb63a3cf1e2723aca81ba/92176039283.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e81791b9db83a0f13656c73c7700dfd2/37184122382.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606f188e5d8ee---lakuni.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dd5e24797a9---sizuxo.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/30862086579.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c168c9f297e---kagikoratupusuwax.pdfIn PDF document text
    • http://signauction.net/userfiles/file/mikiwoletabadisin.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cc9c97f52---livifelepe.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/99c753faa3ac9ad4eaa27c5b6bbcbcfb/nuzuva.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/jimisadi.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/65427149531.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e09bea876b8228ca198c2471d5dbe10a/53291774155.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/52942047045.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/11760862075.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe82007953---dobesekaluxesujuzox.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/11059620141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=metrohm+karl+fischer+manualPDF link annotation

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