Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb473de6ad7431b…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 21:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b8973592aa18b89b382f54c08c32cab9 SHA-1: d87e4eaa9afcf4618840b957beca160c1400223b SHA-256: 5fb473de6ad7431b37536d906142ab2ee78de629f23de730e7da8febf4c61615
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to various domains, some of which appear to be hosted on compromised CMS upload storage. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6111

Heuristics 5

  • 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.
  • 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://ukmriptek.org/codeIgniter-hmvc/userfiles/files/2665074290.pdf In PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/lebojatiduwupewumurof.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/mutajozegesowinolugijon.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/zogenasoses.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec02f11a4---filexobuno.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/62ce60c2379d5b0a8ebec9bbdf575260/52015948723.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/vilutikivaxedibelumumota.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901cbdc9c62---17995180930.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/aric4jal56et2hn7rti71elcf2/61319173679.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/menuzi.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/nepur.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/65506788093.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b3b6b05a55---wamesenijoz.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/xetawetidesamog.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/da2d06ee9aa0c81a2a73cae52c877dee/nowalawonuke.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/g03b8lb2qk510u7hmi7g64utku/98408605360.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/65066559728.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/66808lseq7jqdufg69od1ldp0g/86761676362.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba8538dc0f---zasejovozenote.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef41f80287---betowuzowuwunimelibiwekix.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/cf66c43c38d381d22f91453bea8d3d4d/pobipowamijukus.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/65244253943.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/12408721836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=basics+of+communication+skills+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1