Malicious PDF — malware analysis report

Static analysis result for SHA-256 5157eb3164b2e342…

MALICIOUS

PDF

61.4 KB Created: 2021-06-15 23:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e0e0963678672a47413e7930da083754 SHA-1: df3e03b2d79877f96de9b29efb474e75fd984909 SHA-256: 5157eb3164b2e3428d5c0ea427da9d4adaf5ac5655e1f4218d219172812defb7
154 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. It contains a link farm with multiple URLs hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains a reference to 'Saki saki mp3 song download', indicating a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8776

Heuristics 5

  • 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
  • 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://chcial.ru/uplcv?utm_term=saki+saki+mp3+song+download PDF link annotation
    • http://tofuyatogo.com/uploads/files/17764547966.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/0jdpsa23kur1mj3brcvpg462a0/43564807710.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608253b7477a2---12813796396.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/97691497952.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19c03ff32d1a2ff6e9cc7e6cda57d0ca/5966787783.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/klaim923v6gjf1v6iji4ttsqs2/79415357174.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/vovanunux.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/c3b5a5467ad4893e238815cfccda7a21/93470271481.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/9cjoggtnjuj0ea399no54fp9b9/gesopujipigon.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5485b8433---palerabu.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/81312801701.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/24eabade777bf8d3a6372e1010e49883/zuwopugesa.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/40847702080.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52E 5196 bytes
SHA-256: e01aa0d61853a96e776e8cfb04c0ecec3ca379ff3e308aed9f05db8887c08426

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