Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3939405026a3fc5…

MALICIOUS

PDF

62.5 KB Created: 2021-10-09 23:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 16d52207f6622124d3ee9f02841cd88c SHA-1: 327af940c76150c22a24040309daf016ffaaf5f7 SHA-256: e3939405026a3fc56d9567bb7239141f386060be4b75df2183505dfcd8492e58
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5046

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://giprozdraw.ru/ckfinder/userfiles/files/4742854131.pdf In PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403dba559e7---witufuwubibugolonikin.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/67759124087.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/likobowomasofubobub.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/tenidereliref.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/14651270761.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16153770f2bd93---5926585259.pdfIn PDF document text
    • http://asid.rw/userfiles/file/kekevukabavela.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/fanonelapozojebafetozevo.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/55106934018.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/70928660195.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2b8314a8e---11581219787.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/sazug.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/85470964390.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/60625467388.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/tugil.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/86860759717.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/88185274225.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/fizomopututozapolojazun.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/84684362112.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/90399518985.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/v7fqkpefmnpdro37j7bjt69hd7/16656894895.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210920_094521.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/jifibepapawetoporosupume.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/nezemusaratinuxijik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+are+the+factors+that+influence+public+opinionPDF link annotation

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