Malicious PDF — malware analysis report

Static analysis result for SHA-256 476620bb3bf4c449…

MALICIOUS

PDF

79.9 KB Created: 2021-09-21 02:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ecaf54c5f593562da200466851778be1 SHA-1: e075fa7b052a4f03a4189c17a475128274aba327 SHA-256: 476620bb3bf4c449f11b375f45e5db249afbc21e6b71d5f6ce22f3e2b9777d4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://taiwancy.com/app/webroot/userfiles/files/96282433868.pdf In PDF document text
    • http://ducthanggroup.com/webroot/img/files/jowazo.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/91411350051.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139ffa028b09---tesasazodawunos.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612f13f347793---76007113889.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/aa6fc7e00f9128ae6c7f9825eefcabd6/tipejid.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/nenitobibixu.pdfIn PDF document text
    • http://rcot.by/pics/files/rojoxetajunivaj.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/xoratazowisewepo.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/83169583254.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/rapejuji.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/32962589652.pdfIn PDF document text
    • http://albachiara.info/userfiles/files/35275912907.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d90c973a80---75739792881.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/dezibawedowatoxejudako.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/41820613291.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613e998e7a775.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/rozakexufibizuledesuxufan.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/80715927198.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614916cf302a1---81503645905.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/65377259642.pdfIn PDF document text
    • http://attlas.center/userfiles/file/76974839581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=adult+jokes+to+tellPDF 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_off0000d767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD767 17160 bytes
SHA-256: 72cadee46101ff9e39c87bf38d2f49b08e3218c549e6784c112c2ba24c943f8f
font_01_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 10088 bytes
SHA-256: e59835adae3da8605b7d9a5a16493a23cd2a35404e8a75ccc1652e44199ceb60