Malicious PDF — malware analysis report

Static analysis result for SHA-256 262a39be873af4aa…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 15:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 31fec21a9ed5d0285751cb83c30758b6 SHA-1: dbe7b0ef9387747c6dc0798011e570bbc031ce7d SHA-256: 262a39be873af4aa5fbcbf0ff90821ac4ca6479a1772b15eeaba128cdf22493d
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body is heavily obfuscated and unreadable, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5911

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://egokituz.eus/files/galeria/files/47590547476.pdf In PDF document text
    • http://cssh.es/img/file/waburon.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/51144907021.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/segikid.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/ranokitijigurot.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/71711488048.pdfIn PDF document text
    • https://akconta.com/uploads/files/dinofokajuvepudatupevuxa.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/36949287331.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/kegotodom.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/bofabajidagiladubilagut.pdfIn PDF document text
    • https://betsin.org/userfiles/files/kafanekixisota.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/15f064b36aa6d6855b7f11ff57b5723d/bemugere.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/mogusedesexuxozubowuxisib.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/kiwagojerodibifefogegul.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e40a3cab4---4388464754.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161381dabf2246---36048603552.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/zasup.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/loloviroluxesurerojexezep.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210909_035321.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/95488946923.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210906030954.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/gizadogafepurovuzugivoxed.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/24961479874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=sufna+full+movie+downloadPDF 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_off000118a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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