Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b03c0a71979424c…

MALICIOUS

PDF

62.8 KB Created: 2021-09-12 17:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7c246bea7877fa37406fe25edc795fd4 SHA-1: 6e18833c44d5cce4b94f6896a4361f003337f23c SHA-256: 2b03c0a71979424cc006fdba14a109b524dadbdcb7d6cbb627ed4e4757f162e4
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to phishing sites. Multiple heuristics indicate the PDF acts as a link farm, pointing to numerous external URLs, many hosted on potentially compromised or disposable domains. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5405

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://santehsevast.ru/userfiles/files/riluxojotadupavopodagow.pdf In PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/o8ibgfk4gjjj1momb2n4aj3snf/dunoxovupunodumos.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/kimovu.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/97831270433.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/populasezijopipuxizet.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/90503458802.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367fdc5f687---65209908808.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210909115336075391h9rona.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/patefogo.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613629b83f7a2---bamewurijixege.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/rimoliv.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ggbbovq4v5do912p6013um6jia/zademufos.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137976012b73---52944473120.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/lateduxalevix.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/suvinexapadevozixawi.pdfIn PDF document text
    • https://spyboarcams.com/files/vofafi.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/60605669715.pdfIn PDF document text
    • https://bachson.net/upload/file/tisaki.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/53303244759.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/boxivexusisagepikorif.pdfIn PDF document text
    • http://www.agot.pl/upload/file/wikuxosus.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613302f075aa6---44467059483.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/vumazemofodet.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/bejeje.pdfIn PDF document text
    • https://bselink.com/userfiles/file/9209677964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+remove+password+from+android+without+losing+dataPDF link annotation

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