Malicious PDF — malware analysis report

Static analysis result for SHA-256 b751733d8f4a8d2c…

MALICIOUS

PDF

53.9 KB Created: 2021-09-23 20:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ed3002767946d0286723e6ef57f90624 SHA-1: 9588a6c511c3f0cb4216f26f280c4b78e460b038 SHA-256: b751733d8f4a8d2cbac222db004e6e49ed70057731fb0b89c55449122ef36bc6
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. These links are likely intended to redirect the user to download a malicious payload, as indicated by the ClamAV detection of 'Pdf.Phishing.Trojan'. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4912

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 https://synerhu.ru/uplcv?utm_term=lite+vpn+apk PDF link annotation
    • http://sloplast.com/userfiles/files/dasotiraxejazaxifuzul.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/2741267919.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-10-06-28-59-58.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/9682432820.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614adc33a677d---bapatov.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/66019877112.pdfIn PDF document text
    • http://halanmilk.com/upload/files/54943760533.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/44973081546.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b8d944824eb1ae8ba07a500f7ae97729/93911895605.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/87950047005.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/xovezupatobevaxafovezo.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/rawati.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/gokavaronijavumoboj.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/ritamamisukixomabasefeg.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b1f38c59e735342cd9e5252d875b5c1d/33727759258.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/lamuluruxigiri.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/38032675373.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0ec002d93966338f4df8ec6d80dce74f/turukofu.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/93702755717.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/98775313545.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/sekopisafikizej.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/juparevaxuxusorot.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/sawiwafesujetagopesirane.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210916_065902.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/17256867395.pdfIn PDF document text

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