Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4be665086c9ad7…

MALICIOUS

PDF

48.0 KB Created: 2021-09-12 11:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63c157bfbb602fefd1f42167c48eb0df SHA-1: e6780f0e189bff9f0d0f756fe8485b643e0d97e0 SHA-256: 8f4be665086c9ad7f6c2deecc93e7c27a41c89638b80d166e1f06c6636f24b7c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6237

Heuristics 5

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=download+free+android+file+transfer+application PDF link annotation
    • https://detectagsafety.com/ckfinder/userfiles/files/42475073603.pdfIn PDF document text
    • http://irollee.com/userfiles/file/fisapafugin.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c705b9a7b7---jinipavabed.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/degibotozivonowopone.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/49242141981.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fab33c89a9---75213468971.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9cc049a85---fisaxe.pdfIn PDF document text
    • http://glassick.com/userfiles/file/woxavobajerasa.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/34363327176.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138e4e2ad419---13718266236.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/46511784618.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/jurewuviwupejuli.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/rovisutes.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/82012172486.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/tadozukumosufubud.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/levoxifotuzujukofugob.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/35757282425.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/bupeta.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/67486439356.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/74393635020.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/xibepoximufoduveva.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/23511483401.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/38274907458.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/9045587705.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/18392640913.pdfIn PDF document text
    • http://skisun.it/userfiles/files/15015608556.pdfIn PDF document text

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