Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c879db94085378…

MALICIOUS

PDF

70.4 KB Created: 2021-09-02 13:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 15617f0d6d2a6b1231215795ee6e2dfa SHA-1: 2a49217e27ffe04bfe3dadf79a87813c7bce9de5 SHA-256: e0c879db94085378d1a87c488dc3f19a5ec77fa06c4d3bf69f6b2092b81b6fbd
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to external content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782ed39ddae---wovomezenizibibe.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92a4e8cb6---xijinoxunivi.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/kevomubuni.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/6959752755.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ca1109126---tokidakefilafowovutivubas.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/lpbnsk2fdq87klt5pc32k4vhte/25721198963.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/64535035642.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021062621572380554.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/9611614929.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/4626628206.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/fapivudalerodusi.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e9b74f0630e33add586b377a5ee174d5/zomugasojobar.pdfIn PDF document text
    • http://shosholoza.de/file/tabagetapup.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092bf36836e9---71926922910.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dcf98714b---47449894849.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/30e3862fffc73bac8802df94bb787573/59798251913.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/10836759710.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/33059767173.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3cfbf297283ca3c75e977e6575b50d4a/wewidilir.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/neritafejigilevesiwiv.pdfIn PDF document text
    • http://protok.pro/upload/files/57558365125.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/gibojejenajamisubejale.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/jodavonimesokiruj.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/lje192i7ehvqlstmcfsq1the15/983051088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=uuk+13+tahun+2003+pdfPDF link annotation
    • 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_off0000b558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB558 15232 bytes
SHA-256: c25cf4603fd8888202891f5f0f58a41717fc85ed08d9e9ea17ae309a398df637
font_01_sfnt_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 10604 bytes
SHA-256: 70b820a10aa5a79e6af157a0e8bb1a59a997496053d92e6f28bf0308f44d047a
font_02_sfnt_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1