Malicious PDF — malware analysis report

Static analysis result for SHA-256 616d3c423cb7e644…

MALICIOUS

PDF

64.0 KB Created: 2021-09-04 14:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f86063fb3f97e4c181b7337001996769 SHA-1: b25df66c836c7caada553fa818b1538600763dae SHA-256: 616d3c423cb7e644d7c2e56f539c673324272c2154e7f4b2af299aabe4fd9fcd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating it's a Pdf.Phishing.Trojan. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs and link farm structure suggest an attempt to distribute further malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5839

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://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gewufakeduxas.pdf In PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf701930a1---pikukufejuxon.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/83874698989.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/miwosekakure.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/77808017816.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/visijakafuzotar.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/pazetofisebajudagotejufa.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8a888dbf2---72680539978.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/62339124700.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/lajukenawirofivete.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210801_AE794651196E06A0.pdfIn PDF document text
    • http://wajl.net/img/file/202172224651.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9054aac6e---zotudu.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/89909870334.pdfIn PDF document text
    • https://cuichi177.com/uploads//files/202108081749499753.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17107f0fa0---vasakibavogutizanaxuva.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/kameruzufimifefid.pdfIn PDF document text
    • http://techbis.pl/files/file/tilusala.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/22155867651.pdfIn PDF document text
    • https://fong-cai.com/upload/files/16776057301.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/66qq1g9d0gudsr9qvht5kkn25v/37348750194.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/7f81135c04da9e53dec86140adf63d2c/vewizaguvotuzot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=geotechnical+survey+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAC 11036 bytes
SHA-256: b4ce37bbf3710cdf8c17fd61f561ddba49060c8b5d7ee7db7f54a82a1fa48078
font_01_sfnt_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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