Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e423353c650f64…

MALICIOUS

PDF

68.2 KB Created: 2021-06-12 12:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8567a99098e79d553dab91b7579bbd9b SHA-1: 9a5214fc5c21dba689185fbf2bcfcae4390a929e SHA-256: e4e423353c650f64ac047734513414a6f4f2695c7818e05e13e0d754b3d7562a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the document is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nomylo.ru/uplcv?utm_term=lord+ayyappa+swamy+hd+wallpapers PDF link annotation
    • http://bmsorganica.com/userfiles/file/fanano.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/e0bdcb999c0f91ca5e8be96cfd51ae93/14080525294.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/ebdbf6c2f448fd6615d34ac213d64662/pepodobuga.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4802e118e31bf021f6d93609c1b37dfe/32997037474.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/26038773133.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/nujudalexav.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/62256976154.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/46279563104.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f852f38080---52022731072.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16081d9d12bbf3---46568848119.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/32522690573.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160881776ac02e---xotulivosiguguzowik.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/6kcv7l415b3jefg1g5smms17qd/69101542226.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_off0000d0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F9 5336 bytes
SHA-256: d5ddef46c68a07f7053f198a68ed14299e8ae2c0a9fd20985eba0ecf24efbb5c
font_01_sfnt_off0000e30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30A 9792 bytes
SHA-256: d575e0cde23a91163c22ec42e7a7131a1cb7fa666d44cdf2f3f1c14bd9ac34e2

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