Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad8c716c15370a4…

MALICIOUS

PDF

51.1 KB Created: 2021-05-21 07:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e2f0f29d354e5fdd5fa87fc9efe2c54a SHA-1: 86cbb5852c4a4819baaa9f0fef80976b130abfe9 SHA-256: 2ad8c716c15370a4e5e1396d9b92e827e9c92ddf7f859b7a3c194aceb6073a7c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6878

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://queure.ru/uplcv?utm_term=dispatches+michael+herr+online PDF link annotation
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/4c8dnol59l14qo0gqua7u5nps4/pofabupilonudotiweta.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/1032647466.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/devuxomifugaforipekiw.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc6821f0d9---44992445741.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b39c421ea86a6c4bca7455e94f9c80fb/puzijatekevu.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082c21db6f90---mefukanokugar.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bec93ae49---20591823040.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/gojofotasusokaxov.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719af246f25---polesadukibajoxokamixofoz.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/pawed.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/7ef0554f6786350ff7962715357b6fba/76174243333.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d284232bb---ludepot.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/86290999866.pdfIn PDF document text

Related samples 8

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