Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3eef8a028edb3e…

MALICIOUS

PDF

43.6 KB Created: 2021-10-06 22:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 897b6a8d75a7368b55d3dff493d17cb3 SHA-1: ccbcad1c701c2b31963deed1d375638103d59ec9 SHA-256: 5a3eef8a028edb3e3c76e9f322eac4c5ca2e0650282af17fb115d249b9fe11f9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The PDF structure and the presence of external links suggest an attempt to redirect the user to malicious websites, likely for phishing or to download further payloads. No scripts were extracted, but the heuristic firings strongly indicate a malicious intent related to URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8960

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://wastran.ru/uplcv?utm_term=manual+transmission+hard+to+shift+when+cold PDF link annotation
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/finak.pdfIn PDF document text
    • https://apapunada.com/contents/files/nizim.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/31739909838.pdfIn PDF document text
    • https://st-stephens-church.com/upload/File/96909219365.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/vodefumuzesadadatidotilim.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161485012e2aee---86716322864.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/57lsnc3usdtm3vm12fjudqovr8/togopofarinopetulef.pdfIn PDF document text
    • https://il-gusto.com/images/file/63531815961.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/11488842982.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/83654145556.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/18095940052.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/dixovot.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/xalawakof.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/70694887053.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1a6bda19771fcd0c7e89448db4c4d418/9385969053.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161441aa81e66e---58444436748.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/nunimoboxosavedabe.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/12915329187.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-formsIn PDF document text

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