Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff74e33e1b0413b…

MALICIOUS

PDF

75.1 KB Created: 2021-09-26 03:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0ff9e40b6e47e7d69eb16292d159ca78 SHA-1: 86291c7fd1fc710851376347459fe293b9e02564 SHA-256: fff74e33e1b0413b8b90920fde35c9716f192a04ce3830642604ee0c6cab3629
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • 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://medvor.ru/uplcv?utm_term=naruto+shippuden+live+wallpaper+for+android PDF link annotation
    • https://ikuseikyokai.jp/ckmedia/files/detigamopokixip.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/75574397224.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/463473369210693ba664b68d11752e1c/83147880166.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132def119e2c---tegixufekofuj.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/84023548247.pdfIn PDF document text
    • http://ingore.cn/upload/files/luwikadukifinoze.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/52422347912.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161415633a99ad---6602448845.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210921094801.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/lenilenoxekadu.pdfIn PDF document text
    • https://ccskin.com/geektic/files/vovujizekeki.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/zadorevinavejaxadi.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/61640248937.pdfIn PDF document text
    • http://thevalleytrader.com/files/najuwelonifinaxa.pdfIn PDF document text
    • https://kimansion.com/uploads/file/83623223293.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/gazokuzozubezisikas.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/wetebazobenonin.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dffa74977e---17804001341.pdfIn PDF document text
    • http://podarox.ru/public/files/84761596333.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/33265458798.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/bumemipoz.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_off0000ba36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA36 19188 bytes
SHA-256: 661172072d7b90fc55b70809d9f8352a683e25ffdc8c9b10a80c1488dea9c327
font_01_sfnt_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001046e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 10824 bytes
SHA-256: 0d72fe1e921d07c1cca0d9b82566c27015de4f05b143725a7a6fdf081e5c57bb