Malicious PDF — malware analysis report

Static analysis result for SHA-256 f766f5da6290acc4…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 23:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 52e3b76de2f8635c687bdcc2b862b367 SHA-1: 1b5ddd0481901bd856427991ed3ee94b4b31700b SHA-256: f766f5da6290acc40ec70d2631ed92b6e6fcf99add9d20a3a44d94a9df3e0e45
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to malicious websites. Several heuristics indicate the presence of external URIs and link farms, some pointing to compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5466

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hglobaltourb2c.com/FileData/ckfinder/files/20210910_BCB0F7ED7B092719.pdf In PDF document text
    • http://gestioniarmatoriali.it/43244500876.pdfIn PDF document text
    • http://szjg.hu/images/file/wesuxawijerat.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/kekitoped.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/nojejumazojedinoxoviv.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16130da04c8706---98350020161.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/49285914242.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2ac86d65e---73832656839.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/55941393702.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/voduja.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/zuwexo.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/3ef03907abcaebcac44a7cfc4675dacb/26549566404.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/19a9db2690447125a5fb89179e4919c9/142725085.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/76058263692.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/32735234491.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/97215446351.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/purodamakusagu.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/xizixanat.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/16404436096.pdfIn PDF document text
    • https://inarsindbari.org/uploads/rotulaputupatixo.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/46140012334.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/23690003156.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/75577148108.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161376ec66a2e0---welodipub.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/12516606186.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/wixawirorux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=escape+from+alcatraz+full+movie+freePDF 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_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10865 18736 bytes
SHA-256: 6cdf6027213520023839da899999711190d87c69e274f712223080844355b3f8