Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a16bfc6eb96e1f…

MALICIOUS

PDF

77.8 KB Created: 2021-06-10 06:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0d8fe71d92708de37c9a592d4c6c1566 SHA-1: 31ea2cf3be3c76b84542f6640b93ff0baa722b1c SHA-256: 20a16bfc6eb96e1f6b9bec7075de2c085b3da0ae4bcb966bcbcfa999411d60bb
156 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple URLs hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=tubidy+mp3+mp4+video+hd+download PDF link annotation
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/vo91mads5a6ehbl067of1fn47j/nudogezarawodot.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ehl9ml712bjhsqdkukugph7lcf/77325979666.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210507075728_1741453755.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca302aee8a---6583349257.pdfIn PDF document text
    • https://hsse.cl/files/49118362948.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/tavadotunijabemadufi.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e22321ad7c---mebamebero.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/n3v6jsgivnbppqqf531ca13qlc/72588832005.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/f8c3adba544d2f5e9591dfda4dc4abdf/74087384796.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/51d35565d8bf5f6898f351abb8bf8e3c/suxokelidokudupuvem.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8515b40c487352903682f0229f889fe5/69577211074.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/20605522165.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/tepugigunesetu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609840a270ae1---digabom.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160996c65af65b---57074050179.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/scu1rlvbgd10su6ps94jih8qa4/faxolugapufagadufuwof.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_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 5520 bytes
SHA-256: 2e6c9f545dc05a98cfc8eea54314af6910ee330da618c32a5666aebc9af4f878
font_01_sfnt_off00010437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10437 11208 bytes
SHA-256: 8375dcefec4e01191642525c96f6bf81208fbe23fd1159efc819870a7af80c7b