Malicious PDF — malware analysis report

Static analysis result for SHA-256 c432900543b750ad…

MALICIOUS

PDF

80.8 KB Created: 2021-06-10 14:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 585a751f7a2afd768b7b6f9d04a715d8 SHA-1: 56a8ad07063c03b758e92a0753775a81e014a949 SHA-256: c432900543b750adb659f5860a918bfe9e9249f97e9624942d0f2e438afdff6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://catamma.ru/uplcv?utm_term=video+worksheet+secret+of+photo+51 PDF link annotation
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/obehmp0d237ssbcufhk42o51nh/46700180088.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/u3mpthislns2fllg73d4bleek0/37434409831.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/be0550820dc5c66f2997a0313c396097/19382813069.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/9170302656.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/58167503361.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/wosurejezusawutesuvu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160734eae71b79---13848683507.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d5c18122272daa08f32ce59ed1d11745/49331784775.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160848d23a3416---zilosajivosuwa.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160799708b10bd---37588122314.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/816779bd71124bd3acf4d7192c8a12a7/paduwawuwukekofituk.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/koxobifoji.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/rojizavusawenura.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2f81be3c6---wivobofebelukiwixavar.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/zodisibafapamoxesop.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/c71e48140e360b27eb26e5889e4daf22/zujovupijoxosapodulivev.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ada6265f955---sadujamilugoper.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/39465474060.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10106 5296 bytes
SHA-256: 5edb53f63bb130e08c243a59331775a181c4d0be7fc87a9663f72948d56bb489
font_01_sfnt_off00011333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11333 10248 bytes
SHA-256: ed2c31e9a637607e966a38779b76848e27cf20c4dce75555a473ae6374b0042d