Malicious PDF — malware analysis report

Static analysis result for SHA-256 0835731f6bf2f5f9…

MALICIOUS

PDF

77.9 KB Created: 2021-07-08 22:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f95aa972d5ee8ad41acf7565ac170c1 SHA-1: f92b3321a8ad21ae938887566eccb6e6cd533f0b SHA-256: 0835731f6bf2f5f9c746ac89fc9605714412f5888278eb2623044b48c12d7459
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, many of which point to compromised WordPress sites hosting further PDF files. The ClamAV detection and heuristic firings indicate this is a phishing attempt designed to trick users into downloading malware, likely by exploiting the 'win cash sweepstakes' lure found in one of the URLs. The embedded JavaScript likely facilitates the download or execution of a malicious payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4752

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://queure.ru/uplcv?utm_term=win+cash+sweepstakes PDF link annotation
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5540e43b---72451709203.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/jaxadeleb.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/93899751924.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/94295842273.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/kutoz.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/pirimukakarowufero.pdfIn PDF document text
    • http://domainecomps.com/documents/files/dudakujunesu.pdfIn PDF document text
    • https://blugarden.eu/file/wiraxinawuwuga.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b949a3a699a---jevunigelotuwejutetej.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/zitunuw.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c694e473b13---vozogidis.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/pajikaxenovilawujiraj.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/bugame.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/lubok.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607cce101b151---96987164736.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/8nr39hq5u32anihtad9uf9kbmk/83025603.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6090ef3cb2---3828584530.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cb6f15441---vekefukubajevijonederar.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/33754371793.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/49663332292.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/lixixikajabu.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/72654674865.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/files/rubisadezevulifuj.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_off0000e43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 10376 bytes
SHA-256: b538552785fa6218ae31fd8bbf043c71d7b8382113e201a6c348aa49cf07b574

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