Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c51ba488c061a4a…

MALICIOUS

PDF

62.5 KB Created: 2021-08-28 14:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ef75eb1ed0e35066faf1a05c6dbfed6 SHA-1: 9319c1f8af835094c0fa481a88e7dd58bc123264 SHA-256: 6c51ba488c061a4a38d14b35e413af487dcb6c20e23d0a791aa9b2c178be8332
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be directing users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7898

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://crysiq.ru/uplcv?utm_term=quantitative+research+on+online+learning PDF link annotation
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/7vusmrcj92eu1lu2hk4bgke8t5/10628749582.pdfIn PDF document text
    • http://juentai.com/userfiles/files/nolisepulenegazizizo.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/83907769074.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/f6b07b0fc368762162f475f33e095255/91838701542.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/75294907000.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/644f042eaa220f34cd3fd7ebd80a57f2/wesizudebibomosegeg.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/seputapur.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/zatar.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/besajosudatad.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/dunufe.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1611845481e6d7---gamipuroponiweb.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c12909540fb---6428939640.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/e8095ae6fd7cc5a956644912668f7da0/verudobedidobofem.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7ac03f15---bimoxewasa.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/33355513974.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/51514986537.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/96247129835.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/bepakowosifinijalusotu.pdfIn PDF document text
    • http://carbonelite.ru/file/65969696643.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/lafb8opnlepiocor8qsuuu3lfg/gukixalipo.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/zunofulamu.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210802202232.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_off0000cf04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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