Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24640a81d1edc8a…

MALICIOUS

PDF

54.7 KB Created: 2021-07-16 07:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 336ee38ac44e935b10ae3cd45c5f16dc SHA-1: c9d03382bf69158b61f2df7c7dc2c90a5dfd8b8e SHA-256: e24640a81d1edc8a17efd302af344e998cd8371c5c542a3b97feffbe907ffcf0
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5222

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://chcial.ru/uplcv?utm_term=the+laughter+is+the+best+medicine PDF link annotation
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0b839eefae6d84cf42172589aaf8db39/59529551427.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/gatusipavizojaveked.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/wogurego.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/08bbf48e4f604b13275904d8ff895751.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/83ff08e145b109aaf9c7e4397602a1ab/98971584324.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/xezifesu.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/rivanituw.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/u251inqqqa3lgha0vi5burvntd/96215230086.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/cef7c783418c0db191a70a05b587e836/35269085957.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9c0d5694e---23522167721.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/24748541251.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/iabctsocnlu5nm8qs4c4gkpg36/32922832495.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609881d52e3ea---jejomesedugewurip.pdfIn PDF document text
    • http://kham.vn/userfiles/file/nukimegovefixediragim.pdfIn PDF document text
    • https://clinicscrm.com/img/files/jamimiduz.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/014f4107a70f7964c3c69fe67b854421/79426094400.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a34e7b1f2d8---20001970326.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/1eff9guku8rhldprkv924h8174/mipijurut.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/daluxatisisuwawivup.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/vidijoluwujebazuse.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084032608dc0---nerisapotoragewalu.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3e215f28c140021b21f0bffbd579ad4/26776900471.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a737a7e1f---62258468410.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/tijasunafolutet.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/67945228376.pdfIn PDF document text

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