Malicious PDF — malware analysis report

Static analysis result for SHA-256 551d5faa4f712c7f…

MALICIOUS

PDF

74.3 KB Created: 2021-06-09 12:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0d102432eb8851f5b9cae0a513e846f7 SHA-1: 9e644b1e450c26a7efd8bd024aa7c14b192b5d8a SHA-256: 551d5faa4f712c7f5f1a009474a6060bffa00f0ad3aaabe952651b3146610d01
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many hosted on compromised WordPress sites, suggesting a phishing or redirection campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to trick users into visiting malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://queure.ru/uplcv?utm_term=cyberpunk+2020+blackhand%2527s+street+weapons+pdf PDF link annotation
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978f8e99eff---ramiruxuduku.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/76833460373.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/99mjop9bkuuse1lhagirkqd2f4/21122654630.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16090342130e00---livemajepozuvedovajigo.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/73596547478.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/sifolelizogur.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/82024345980.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/30902728751.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/f2aa90cef1d69c760438c5a736a32fd6/82903719982.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/9bd027aca4d915755fb2609a0daebf33/50905756023.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d54f502f90---57500937613.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f49dccb58---31081843132.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/94701636500.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/jebefomiloviwiridukudar.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/4cc4fe4e4ebb92d0e7dcc78a016e0f3a/80854133049.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c506677e---23436630870.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/fdor5m3ut32i2c0qqaohtm0jo0/12479726602.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b66b702bf---39960119058.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_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 5852 bytes
SHA-256: e1bf24d8460d378719d550d4c7e5ca02d142cc008a201bd93e7df61fff04bf87
font_01_sfnt_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 12236 bytes
SHA-256: f5bd8268d69f3f6a047e8f48748f011d28b797a31ab4ae3642388accc31750c8