Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb099d7803b81084…

MALICIOUS

PDF

71.6 KB Created: 2021-06-06 04:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7c1a80c241d53036b8db5579dc74e765 SHA-1: 41f1e96ced4e2d3ab94debcc7b0e4290fea74b87 SHA-256: bb099d7803b81084a5606fe9311a793cf7f8cb6e349a1b72d48799751ad10b38
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of 'yohoho.io hack coins' in the document body and URLs indicates a potential lure for scams or phishing.

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://crewmak.ru/uplcv?utm_term=yohoho.io+hack+coins PDF link annotation
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/pdba2kgba8ola1ilo61aoroivs/23223924505.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/60lf6k27fu4lr0rprevhn3tb28/54629469271.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c05162e3c8---19046308208.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/ceded96nj1sdcp98b2fv77d6uv/82435259630.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0849765bb9---zegekedusizu.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16080f93a9a448---vorikazuwadopowavifebod.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/pomoziluxumibigis.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e0725286e6760853ba8ee36dc076271d/fikeximos.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/af5c681e0959d3989e47594d441e8643/74891901099.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/d9ffecb22eb3175f76ad7ed32834e229/sarono.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/26048054672.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/fudolesip.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2126514a4---87497428782.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ced0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED0 2960 bytes
SHA-256: 9e8301a812e0963997f2c69c75bfd39e7fcc44359b8a43baf6657440e065e79d
font_01_sfnt_off0000d940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD940 4816 bytes
SHA-256: 0e00adf4d241354d639ff457e54042cd4d0320f23e2cf8d916d57d835646b8a6
font_02_sfnt_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 11220 bytes
SHA-256: 78d5ba59fa2a28d876137ddd3fc8c85e9aaf62d657b99d4d50ad4d83eba50b9b