Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3752e55dfb1708a…

MALICIOUS

PDF

57.4 KB Created: 2021-08-15 23:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: b401810b6a3a6c19bf83452e792e7f2b SHA-1: ca005703df4c9e00d516ab359ec6c25fe69fbd61 SHA-256: c3752e55dfb1708ac2061abef53f8c26a7eaa8bf8a1b154bd18498ebc63e043b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7666

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/61d34fa8c8ca593cae7231ded40d14dd/waxaxezinogasagubexivix.pdf In PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/datixelu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ff869c7eb---jafudad.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/53932814548.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/kefidiwawakodel.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/ramixeboduwepog.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/19094936059.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/8423434737.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/pabapatabok.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/14311027242.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609170967d64c---13987045762.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7991c60a8---48238873117.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608068b3c2464---60836321259.pdfIn PDF document text
    • http://yuha.be/_files/file/mafejaviwululub.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/17255116246.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/1fkmk9lhhs9d5gen4v3hvei18n/94961712209.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/m2v276g97pig1j17919qj98q17/83195729268.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/j4a8m22t24j71deg2rdefsc1tr/11632785256.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2e62253c4---dutijofumunavuzana.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2600c7ac71---pafilizo.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/gafoniripujotufosoxuveged.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/41326972089.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160848cc47799c---pobewijutalupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=libro+de+biolog%C3%ADa+2+bachillerato+santillana+pdfPDF link annotation

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