Malicious PDF — malware analysis report

Static analysis result for SHA-256 43583f8124b256a0…

MALICIOUS

PDF

73.4 KB Created: 2021-09-15 19:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9e108e63eda98209aaffc3c073504d70 SHA-1: 6da64439a7b1e0fc69c350384512cbcb447e906d SHA-256: 43583f8124b256a06fe7cd082f6cad9c749f47ea0e22778a81f1eb0badd54a3a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely phishing or malware delivery through these links. The presence of multiple links on compromised CMS upload directories further supports this assessment.

Machine Learning

  • Nyx PDF Classifier clean score 0.2226

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 https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/39b8f9a91b0aa96e6092ad62679906a2/kesejitelapebilafesilul.pdf In PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7220e47f---jujumonofatusepebiruv.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/82597351487.pdfIn PDF document text
    • https://carlojans.com/cms/file/kexaw.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53a3b15f2---nesipodej.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/34059697294.pdfIn PDF document text
    • http://chinazzjx.com/d/files/forikuzuludetajad.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109110150117700.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/loguzoboravimodokifowaja.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/selubedukimujuvupaped.pdfIn PDF document text
    • http://dentistturkey.com/image/files/jezomarumowirizugut.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/mewekolaberejomeso.pdfIn PDF document text
    • http://kaies.net/upfiles/file/47456518206.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/tuzokitonosejoj.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/vosimonajubejepuvu.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/69209158831.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/18803257331.pdfIn PDF document text
    • https://emmaushuis.org/pages/wokurinevafir.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/68401030525.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/jujotopikosazonuz.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/89288315892.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/10981395378.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/20650051191.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/xupojujatojisibinotomadi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/59799035233.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/48292842723.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/47612106418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=free+fire+android+hackPDF 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_off0000dc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC76 10332 bytes
SHA-256: 0ce3b84fbb0ec849f9838aeecf7a6d8b459cd5913014e1d88d5a3e04e0124463
font_01_sfnt_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 17532 bytes
SHA-256: ab0a2ac2a370b68e449562c60ea17baaba0f09ffb7060be008505ef9a7c3d1b0