Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce53ddcd881855a6…

MALICIOUS

PDF

119.3 KB Created: 2021-08-12 20:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 47e96d6e227d72dce5556acac2184938 SHA-1: 78abbcc578590cd7519f8224667246ba28aea269 SHA-256: ce53ddcd881855a6fa183d4c15158ee8d44cf7b96787d443829bbbb8c347c468
154 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites or disposable domains. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9415

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://thaisomboonautopart.com/userfiles/files/noxatigijodorisevol.pdf In PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d53684d608---zasude.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/wugepodikufimujo.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210518194407_681099953.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6c8ea7d4---sedanukavomenawiro.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/44645224893.pdfIn PDF document text
    • http://wmhsclassof1977.com/clients/34196/File/90391521468.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/wenoxivogomojawor.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a67b70fe8---laxepixiwiroletelo.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/44601700617.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/32863737577.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/2e309cb204052dd70b11b7bd8ebf7bf1/80761558751.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16106ebe810dfe---piwej.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/f554da03362c85de16fcc9f71552f2c4/rokifuruw.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/damozujofagem.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1328f4eea30703bca9698bf907b550e1/61314633487.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc2d93fcd3---kedezodatisiwagirazu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8937b3b9e455f975e242c026a48c4fe6/10154233198.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/57194990733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cuantos+atp+se+produce+en+la+respiracion+anaerobiaPDF link annotation
    • 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_off00019641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19641 20348 bytes
SHA-256: 4a79bb7852d6e8962926cf3a9d3b8cf416d40175c3229948746b22389b3d0969

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