Malicious PDF — malware analysis report

Static analysis result for SHA-256 f873687bc89b18e0…

MALICIOUS

PDF

53.9 KB Created: 2021-06-11 04:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: e811e6cde017529dd37ff15b75a84ff2 SHA-1: 908ea4a3adaeed26976ba08ed796207c12042938 SHA-256: f873687bc89b18e0c2f9ed822e336a31dd8f35ccf059f13c24cc910b92ef9d2f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or serving a secondary payload. No scripts were extracted, but the presence of external URIs and compromised CMS uploads strongly suggests the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6272

Heuristics 5

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=memento+mori+jonathan+nolan+analysis PDF link annotation
    • http://buergerforum-tirol.at/file/69060334856.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/4c074dfea2b786f6093ec0fd6d4448e2/49306343195.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608914708b378---jiragowelogajozigukaz.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/lelepotupemirevojiled.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/voxufefavenodibina.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/35946699559.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/38855a721d707ea21b641eb18e563691/47173177173.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe7064d471---buxuxumivoji.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/16378108375.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a56a18cca2d---numifebepifef.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b981523f94e---41330549637.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/7uke4e7088r9robnt2i16jhslp/wozuvozeredogoreme.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/45725412939.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/481c4d0a378be5bc10e87385130f42eb/24583620345.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093bea1e6c3f---16990295126.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1d1d0a22704cba96d56277a5ecbc9aa0/89717162231.pdfIn PDF document text

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