Malicious PDF — malware analysis report

Static analysis result for SHA-256 0683117ca99f55ad…

MALICIOUS

PDF

93.3 KB Created: 2021-09-04 03:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b803e4e4d1fae4b084dad5e2ab0ca18d SHA-1: 30987f7626f07b4f4a4b18509da79c66d5a3703d SHA-256: 0683117ca99f55ad3f5084bb7b2364613cc2bd98c28faab5e799b50ffa7e3a0b
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting services. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3237

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://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/9jvhiaj8f3i74ftsfbnlh9rjjd/rowowe.pdf In PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/fonokatovijuniravupofex.pdfIn PDF document text
    • https://media-get.com/userfiles/files/81610133862.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/wadejuvuromafumowakusew.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/53074877515.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a21d0be33b---saxibevunefedit.pdfIn PDF document text
    • http://mobilenmr.com/files/files/wijufugaletisugod.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075db26eae3b---salenopekeloturimaxepan.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/61593756595.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210825125321.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/zawozapado.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/bidiwoterakotol.pdfIn PDF document text
    • http://innotack.com/userfiles/files/58209067208.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073468dc5d61---43006742650.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/dejenaxet.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/74495116025.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/virogak.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609103d72b93f---kolegidutesupomemekuvogol.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e0300b1fcc62241da26c9b9d9408a23c/raneweze.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/78528012546.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210829_37340704AA399DFC.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/vepuriwamez.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/zokujemelazagivoxelujepiv.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160729cb340a08---pazemokipuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=human+rights+in+tamil+language+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDC 18660 bytes
SHA-256: edd88cf870169dbe3e8726d518557845522001cb2b339dbae459b94e6cbe8feb
font_02_sfnt_off00015e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E3C 10916 bytes
SHA-256: ef549086efba4aa40d0d8b294be81216618a502928997f947dfcbba6d3afa1ad