Malicious PDF — malware analysis report

Static analysis result for SHA-256 904aed16d69b1b96…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 12:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6cff89cc0559cf6d5e50ab7174b38966 SHA-1: 4d267e416fa5b878247aad9f3f88c87e63bad4f7 SHA-256: 904aed16d69b1b965b7afbd3bbf8d9efe869dc742013bd298e696b7b4278e74b
196 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm and a browser installation lure. The document body is heavily obfuscated, but the presence of embedded URLs and the 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggest a social engineering attack aimed at tricking the user into downloading and executing further malicious content, potentially via JavaScript. The URLs point to compromised WordPress sites and other disposable hosting, indicating a common distribution method for phishing and malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://kcss.hu/korosi/userfiles/file/pisujasoxotaxuna.pdf In PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e5b3a4e99d89f25aaa15624bfea92201/gilezupomiperop.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078713840aa1---ratezoboj.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7eaf71f4f---dezomepupirowinef.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/16921654616.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/xofefetagofewemowam.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/63954778234.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611fb1bb9f9ac---8330664956.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/fifuguratomi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612781bd7b926---50148930717.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/wazibewugobilajosedifonab.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/bazitejusagosa.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/9mv2b976bgq119sdhnfk7sfsar/jomusupu.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/komozimafufalikijenejevi.pdfIn PDF document text
    • https://nasikampung.info/contents//files/47894083891.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/3247ai982mevba219pf0a5iq7s/71637714190.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/mowufugadiwesupelok.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a178b0b5fe2---lotarijuxuj.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/19608236340.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/23358884989.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/694135ffea99afcf3727dd98475f70d5/26998341703.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/5f2aa505254bcfad25900268e29ac121/gulenalafogezoba.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fad8e05b9---58973811088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pdf+read+out+loud+no+soundPDF 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_off0000e129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE129 17788 bytes
SHA-256: f53fca17b95fa567fbe60bfa66dc9f2ba4e906125ea1278e5932ef2f04f404aa
font_01_sfnt_off00010f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001274f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274F 10356 bytes
SHA-256: 933a94801ef68ab5d1e00c4773acda7815f683f9f3d9bc320c88c6a7376e9cec

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