Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa2a6f814f09169…

MALICIOUS

PDF

56.7 KB Created: 2021-09-22 22:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e277a55eff183f5195ccf8320008d051 SHA-1: 5bc82511858ef813d31db76ae72a7a5bf8312552 SHA-256: 7fa2a6f814f09169ee149d2b242a1d7c82fdc36d859bbf73fae724f968aad3ec
162 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple external URLs, some of which are hosted on potentially compromised CMS platforms. The embedded JavaScript likely facilitates the redirection or execution of further malicious content, while the link farm serves to obscure the ultimate destination and potentially improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7223

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jamisonfurnace.ca/userfiles/files/71765083193.pdf In PDF document text
    • https://btsis.com/upload/ckfinder/files/58960404456.pdfIn PDF document text
    • http://boldogelet.hu/media/romun.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/79110579732.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/jufiv.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/87636331862.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/nadukobemagiri.pdfIn PDF document text
    • http://hodori247.com/uploads/files/97343498822.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/48838731515.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/f3c1tpev98oekioi9cuvl91gh7/fibiwijebazipizufaserataz.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/movinimisiw.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/papiteta.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/diladaze.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/2901590ffb954d5b49982a3ef2f1fc62/9517118920.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/muguforarudamu.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/jazepuno.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138ec8d371ee---lubibuwikurapig.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/zikufonojateg.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/47323694862.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/janala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=best+aviation+apps+for+androidPDF link annotation

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