Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ce3b8e73fdda7d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 03:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6384c702b42b4c8a381c8d3797d8da73 SHA-1: 07df59444ed03a9397260184eaa707529823f218 SHA-256: 19ce3b8e73fdda7da0c0a48624b92927ec9ce35ae45c9aab3ea04b6a3791cc2f
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF containing embedded JavaScript, which is likely used to redirect the user to external URLs. The PDF also functions as a link farm, hosting numerous links to potentially compromised WordPress sites and disposable domains, suggesting an attempt to distribute phishing content or malware. The ClamAV detection further confirms its malicious nature as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4747

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://nomylo.ru/uplcv?utm_term=cambio+climatico+y+seguridad+alimentaria+pdf PDF link annotation
    • https://santechnikosdarbai.lt/images/files/defekumopikezitujamulel.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/tumawetazu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f631cce6da---78115551242.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/58d9a1b40c53c25a53846c0fa6fb8039/jozigogazoxogafefipumege.pdfIn PDF document text
    • https://esz.jp/img/editor/files/dupekexojiwifiw.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/46372844888.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9d3c0ecbb---xiwinemuti.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/37311161229.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/sumezonamomobovamofejan.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb4a2bcd28---91698162926.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210904/16307139258189.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210723_075317.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/takakijujipasevi.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16076d2713c0db---sirubidevijirot.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a689bb04---62736850307.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/71832397352.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7b26686928cb8444fa34755b24b3fd2c/22307490356.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/kodetigab.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/79728203527.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/vafevogakowegedavet.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/kurad.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/6962691491.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/nanexanuzodujalateloba.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f06ff0897a3---3359466722.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001018d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 18448 bytes
SHA-256: be8e71aa08821dd7b711f76a442dfc615389050e1e4c84a521f968d87e316302
font_02_sfnt_off00013121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13121 11348 bytes
SHA-256: b3d73c19396df29973a34b0e0337d480c5b8a6690cf0baf99b5ac61278a44fa6