Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab66e50892477e23…

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 14:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d33e573f7fb93f32c7b557d2448ca635 SHA-1: 10d2616fa64b0acbafa3988cad23599fb6a738b8 SHA-256: ab66e50892477e2315991341b0b3241fad4d039f2cc28d6ace2900f52031e0bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The PDF also exhibits characteristics of a link farm, with numerous distinct hosts and URLs, many of which point to compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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
  • 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://svarovanijelinek.cz/ckfinder/userfiles/files/tobilokuwegexawupidas.pdf In PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e264128f4ccd9904e6a5568a3bdf75fe/58239006785.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/27936749196.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/gemejezazovase.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/31043587451.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/2c559fdab564ed1cc86a30d6433b9943/gobuxoxezusa.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621303555.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/k2a6omd7leqghiq44sv6t0jfoc/tebiwoxofupinisetutofego.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/bulotare.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/7388562d3bd52fa3997d18dba361a993/48612235832.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/v7dsc3r6dqspk9bifr10vh0neb/3366042557.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/66340614420.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607d905d41016---kexaxevixipibu.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/tagimitiril.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/vominasorodevi.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/46198994619.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/75823143554.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dccf51d26---70285256792.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/21342433319.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d21b0fdc0---nosinizaduzasamasupef.pdfIn PDF document text
    • https://zold-kommando.hu/files/gidapemepun.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2bf6d7963---8542615518.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/c9avecjd5130b5o8a20qvqoihh/38885050941.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611f1e10f1311---29336605526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=gillette+proglide+styler+user+manualPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/63854090706.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_off0000bdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD5 10988 bytes
SHA-256: e2f42cd1f1a47845ddc4397727194aca64365583ed47f2a84502abffa4a14bc3
font_01_sfnt_off0000d724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD724 17008 bytes
SHA-256: e95da00992666eb6156239640f7f33567aab0bb3c88de1ba4b33dba2cc63e24b
font_02_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1