Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1daba2cdbc75442…

MALICIOUS

PDF

72.1 KB Created: 2021-09-12 12:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bdd4558562846f80647b340c62991bb9 SHA-1: e0767d6d0084b94745fba2da72910a1005d44031 SHA-256: f1daba2cdbc754426209294636f544304d467115989aa6c5e34287cc0db5922e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that point to compromised WordPress uploads and disposable hosting sites. The primary purpose appears to be directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6691

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://irlanc.ru/uplcv?utm_term=yu+gi+oh+nds+rom PDF link annotation
    • http://otevrel.eu/ckfinder/userfiles/files/pezojumeze.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa364ad9a1---waginuzonisanebewopep.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210907084916911307482.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/99327472886.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336cb4dca5e---78654730622.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pavasupozowe.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133887548c3f---64692897699.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/35388486470.pdfIn PDF document text
    • http://polkovnik.su/upload/file/32589348890.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/dufipenolodefatugelub.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613804e84daef---61628130668.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/98109466139.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/20619417029.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/pivizimibapo.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/727brbjn9usl6q891bm7hembc0/62460723683.pdfIn PDF document text
    • https://led7.ru/file/dizaterogifad.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/bigaf.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/49409119493.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/50021988954.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/78845663955.pdfIn PDF document text
    • https://bfull.ru/uploads/files/viriv.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/47253757850.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/vobunofuva.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 17776 bytes
SHA-256: bd04508820995065b8ba5010b6a6ce260219fbba844ef462782ce5ea8126db07

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