Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f89841b17b91f05…

MALICIOUS

PDF

41.5 KB Created: 2021-10-05 20:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e6f1410a0743d62c8b7dae98e3171987 SHA-1: bf0ea5906a21d595ac4766c5e748753d490c3d25 SHA-256: 4f89841b17b91f055657f2d4dac657e251a859e0bf99d42f6ec81d974134ea43
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, employing an image-only facade with a clickable action to entice users into downloading further malicious content. The presence of embedded JavaScript and numerous external URIs, many hosted on compromised or disposable domains, strongly suggests an intent to redirect users to malicious sites or download additional payloads. The ClamAV detection and ML classifier further corroborate its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7814

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 41 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://queure.ru/uplcv?utm_term=luv+is+rage+2+download PDF link annotation
    • https://nacionalequipamentos.com/ckeditor/uploads/files/xupekifatedivazolarisenom.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/90188941333.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/nowos.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/43654707711.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/27658608736.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/wexikoxoputitogadoxupote.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/zolisijemifelonidob.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/54878207551.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/tevopunepisaf.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613b88a6e02fe---detixubedoxugobuvipirenu.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/le7n8i8fo2jrrlsrvcsjk4phvs/mopamezowogeleto.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161315bd119532---84339017864.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/58356307284.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/29767784952.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161539f850750d---47469501081.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/48281523232.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/17651101736.pdfIn PDF document text
    • https://apelhijau.com/contents/files/sopogovusizugeladateniz.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/mokezijodorus.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/boxerivisazubu.pdfIn PDF document text
    • https://kawanmto.info/contents/files/tixovubija.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7df07144---21337573980.pdfIn PDF document text

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