Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b67ebe9a6b84b65…

MALICIOUS

PDF

66.5 KB Created: 2021-09-17 01:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f918d882389fdd59d397d814fef4fbd SHA-1: 26849405ccf85e0f4c4664b8fdcbd270d07bbd3a SHA-256: 2b67ebe9a6b84b6593b525e7eceffa2199dece1af2faedab2e926a65f8f37165
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3605

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 http://goopenapp.com/uploads/files/51870320895.pdf In PDF document text
    • https://wittnebel.dk/file/zejedekedetetifosugivu.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/xabutetokebivexokatujopo.pdfIn PDF document text
    • http://prota.ru/upload/files/47658843149.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/25867706854.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/toworelejegoluvuba.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/felixulijojubojof.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/18169592013.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/69470746672.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/jexaxuduzejatege.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/5811506239.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/lojizape.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/70141543584.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/rikozoxitimagukuzez.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16142eaa88af1a---63592700788.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/totekufesuner.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132b8ddc609f---tobop.pdfIn PDF document text
    • https://red-adlay.com/upload/files/jinovejag.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/86791456822.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/43939138220.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/riberubi.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/94b5qlj369otd3p8p0mb0op50m/buwewapu.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/84021510597.pdfIn PDF document text
    • https://tsegypt.com/file/kikutinogebewepikaz.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/bf66cce9d2fb28f77d795fe9aed186c0.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613065780273a---61846001359.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/17691846773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ielts+general+reading+test+papers+with+answers+pdf+2020PDF link annotation

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