Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3e56e8f39bee5d…

MALICIOUS

PDF

79.6 KB Created: 2021-08-20 06:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 52a30a082c93f7326bd9b6b7ae61c9d4 SHA-1: 638274f186c45e9bd8a38f255d74383e928d500e SHA-256: 8c3e56e8f39bee5dcb368ca17ccd9a0898a6f23e1068a3b8732d52d67179dc85
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The numerous external URIs, many hosted on compromised WordPress sites or disposable domains, strongly suggest a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7217

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://huntic.ru/uplcv?utm_term=solucionario+matematicas+5+primaria+santillana+grazalema PDF link annotation
    • http://imoroz.by/upload/file/27268660255.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fdca772e9---82983797030.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/49357473201.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608664387573f---84245053275.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///rosofipix.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c4f11b557d1804e84f53cbb3c7f7ad35/galonavinuxigunubebiwaf.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/69528172356.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075809f3db56---39896016004.pdfIn PDF document text
    • https://birotex.rs/images/files/92550059245.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/vafaxanagitavizux.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/vebuduzegesevuseviburi.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/7278620228.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/90496360445.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lujuwugujikiwitizifipokiz.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/kutetemonuniw.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fe5793da20b---wuvogatavarajujifag.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c748ffe8dce32e27e525a5ea0d44756d/40022820634.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbbe3a44d7---12203866036.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f8092b809---155791535.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/12316054651.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210523010548.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/60664694875.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/78803440844.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/bf738081ace377212514e30684033dce/buzukamemaboz.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/ximatidivibi.pdfIn PDF document text
    • 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_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 17808 bytes
SHA-256: c14f1e905f05b084725a36bd932b31af0bfebfd2926b45493178cecf9bc5c676
font_01_sfnt_off000125de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1