Malicious PDF — malware analysis report

Static analysis result for SHA-256 7246d9f1a67a6ff4…

MALICIOUS

PDF

59.5 KB Created: 2021-09-15 22:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b6649a12dc6f05a5cfae33fddb832553 SHA-1: cef7059ed94840ea0a0dcff28b4aeab089f7d892 SHA-256: 7246d9f1a67a6ff4e6e8246c7bd13322b463d088db2a57dd4472a84cc1ce2b7f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7649

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b61c5e2f78---xevixodusikatorokimad.pdf In PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/82506492008.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/zawuzozebami.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/zuxefem.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132aa434df9d---fepebax.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/xozokemowuruzakevotupad.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/43136895454.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/munuzepi.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/7985066994.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/pifijodo.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/wetapofako.pdfIn PDF document text
    • http://vodova51-53.cz/files/17188848456.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/70042548922.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/93602740105.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_05_22_59_58_2021.pdfIn PDF document text
    • https://path.mn/userfiles/files/23671515791.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fa6ec3f6592371132deba1924b787bd1/towazero.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/92129046758.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/lowenagisoxopatikidewotam.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/29360870.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210907_060416.pdfIn PDF document text
    • http://klaaswester.nl/img/file/gugabilu.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/murulogaraj.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/10438658642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cool+math+games+run+3+moto+x3m+winterPDF 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_off0000b32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3D 15924 bytes
SHA-256: dcf0d0065f1e4a69aea2907f9bd1429a9e9c55b52af082c4ef2c2d0be4306308

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