Malicious PDF — malware analysis report

Static analysis result for SHA-256 53671db75131d7c8…

MALICIOUS

PDF

49.7 KB Created: 2021-09-04 18:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 588654aa07f397cc7d7cc3600ac02652 SHA-1: 0dea19c6f7dcaf029dcb0648b4d2c73ddb6bd1f9 SHA-256: 53671db75131d7c8a01acff82b37fcc31854864a3122c67e23ea7b8b7c03c066
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves directing users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6843

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 http://anjilh.com/uploadfile/file///2021042909111625.pdf In PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/57648636027.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///85718565961.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810141478c6---44645645996.pdfIn PDF document text
    • http://oodow.cn/upload/file/2107220737421727513pm4p92zwsgg.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb10d981f5---84962731336.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1ac78a791---tedadekonepu.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/33615210089.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/nogunigeninarebik.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qdccjn9dlu9gjpr0n1i87bq88l/lidanojuxokomi.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160840b534cb64---jaluwujit.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210609100300_m5zfgf.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021070812371055.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d7a702e6c---66809814800.pdfIn PDF document text
    • https://langumeistras.lt/i/File/28181897639.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/boburawafavaxipisa.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/893c7637f499fd377b56b82d32e8f794/7114679059.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/gibijamejefukikamebaf.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///bagobifivoraretaxupaz.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/025a2035b06dffd8563672821324e549/86929837916.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bc0a851ad3---29226941770.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/jelibafuwaligub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pr%C3%A9paration+physique+handball+pdfPDF link annotation

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