Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd7ed0c09621163…

MALICIOUS

PDF

41.5 KB Created: 2021-09-29 01:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6f037a4c03fb845f9b8096cc34042940 SHA-1: beb248cd3fe15ade041e17bdff51efe5454418c9 SHA-256: 3fd7ed0c09621163b5ac6ab3c5f1879c7bdbfeb9e5ed840ad8cacd12ce7eeb89
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8695

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=download+android+minecraft+java+edition PDF link annotation
    • https://designclarf.it/file/36332704754.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021092600341333.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/68300514327.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/nuwusijuzurobibubo.pdfIn PDF document text
    • http://vitcongiong.com/uploads/files/sebizobijasosimimuguwufu.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/85938891275.pdfIn PDF document text
    • http://ducnhua.com/upload/files/kezipobo.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/42793580707.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/mataxesotodufob.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/820hone6862o3ct0lrlm9jlqa7/mesenokopomiguniwifiko.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/pojomutoni.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3696f2dac---44465304367.pdfIn PDF document text
    • https://angkaindaman.com/contents/files/20988527850.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eb78a87a2b---silepalibumosefalegidame.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/rimidafuwo.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/tebakivigutotipomuguge.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/5999441029.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/novabebogadagetalilegiki.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/47451991975.pdfIn PDF document text

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