Malicious PDF — malware analysis report

Static analysis result for SHA-256 0444d457aa59f6e6…

MALICIOUS

PDF

56.8 KB Created: 2021-10-06 23:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a6aa3c396eda3db90f81a92be52c51ed SHA-1: 1229beeb48bf949a75d7918ee7105112018e4993 SHA-256: 0444d457aa59f6e6245ba0f1a45a981b189f277e39a65c796726c76644e75f5a
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JS and external links suggests an attempt to exploit vulnerabilities or trick users into visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6236

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://coretry.ru/uplcv?utm_term=rending+meaning+in+tamil PDF link annotation
    • http://soeurs-scjboran.fr/soeurs/upload/files/64494500877.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/78648317115.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/wugakomaketuwagema.pdfIn PDF document text
    • http://sbairs.com/datas/files/lasajada.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/kupunovanodiso.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/36769547181.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/fapovigusivolerevapab.pdfIn PDF document text
    • http://soc-in.com/data/media/files/xakopi.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/33492948438.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/xemelosenak.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/mufazenetoledebaso.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3a05431332a1782b4f597c1facdc1fbd/venowerixubuw.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/86655161266.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/57000949747.pdfIn PDF document text
    • http://master-vin.ru/files/file/45566855609.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/b9c071e82e448d7118eafd4ec0c345bb/vawolunupotiwozavorux.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/japezizupotutefasurada.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/18807345381.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614a07c218346---72172594786.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/folagivojir.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/zonoxa.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/29307525912.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/wimirusotulux.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/70384707129.pdfIn PDF document text
    • http://cascad-trans.ru/files/munaxovikekox.pdfIn PDF document text

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