Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb3bf25d019a985…

MALICIOUS

PDF

91.4 KB Created: 2021-07-31 01:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cb9817ff06aa7fc676ad38fa533bd53e SHA-1: 1ccc55f0a1eff6db404cc7a095c0a8c262389c09 SHA-256: 3fb3bf25d019a985ccb0802707e1a5f08dd3c6f71046c510678211727af6b63e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://crewmak.ru/uplcv?utm_term=cheats+for+minecraft+pe+apk+download+0.16.0 PDF link annotation
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/dekojoserakolutigek.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bc48a3267ab3461e02c28df004c58769/81409676950.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6bc4aeade---25411167240.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/mukogiwutukuxolur.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/r0pfp8na88ke859qo2j7soo0nr/8062081465.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/29070935149.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/panabetojaseloj.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/rimafusevixus.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c384ca2d129---vamezagaku.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/3564306368.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/dabemanomisogenukufatez.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/bd865da474b16da674aeb0ba0db14487/69705923549.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/6bc6704f1ada51540076227857df1568/busudofugezi.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/jezusabefivujav.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608234661addc---nujujelu.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/36407172484.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/2638670722.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792e574200f---jagofotizitasulodevewiwex.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/gazekuvex.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/wajokomipolube.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/91037198577.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles//files/rabamalisute.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8682a5256---71501565681.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/jeloj.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0885d0ab6fbda6dd2403f1d41cee3ab2/78341007647.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 11504 bytes
SHA-256: 36ffaad09e7fbf5cee56bf3495cac3e646f193aff68d20a3c2a0c6e4fa9922a9
font_01_sfnt_off00010b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 23176 bytes
SHA-256: da472c29dff2da37b72685d1181e8f71e1a7e96450cc90fb70a26b9e41bb22cd
font_02_sfnt_off0001457e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1457E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1