Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebcbe558be049e03…

MALICIOUS

PDF

81.7 KB Created: 2021-06-09 14:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2e7f7279bcc409d490e6af2925d2100f SHA-1: 2b5f939b6fe33434cb044cfa7bd44af1138564d7 SHA-256: ebcbe558be049e03cf50fcfc6dfa1e46ad6ce2ce227637edb30b47bbe755f63d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs, such as 'https://huntic.ru/uplcv?utm_term=21+lessons+for+the+21st+century+pdf+book', are likely used to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://huntic.ru/uplcv?utm_term=21+lessons+for+the+21st+century+pdf+book PDF link annotation
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a17a6d256b---76333996573.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/24f496719e7ce66e6d773518f60f93d8/wofazoxunabonoli.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d1104afce2eb52ccfe9e2f0919a5c46/jifotujudukojizulu.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080af32cbe79---35402175437.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/16566287261.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3781746ff8---31214474107.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6b7f3ad3a3464d360e242358cfbe4e1f/65732495223.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/pu5jlqvpbis8s4hrh971nckkdn/90298828914.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca13144b1---18820563732.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68c4de7a0e---tiforezevalokilot.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098306167442---fewenase.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b92e8c209fe---nasopevibi.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5f0e144e---95681237231.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/xexojutefunexum.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add4e00c8e5---lomada.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_off00010048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 5428 bytes
SHA-256: 73c449a447fc07a1e43006cfa04f68e48b0341fda7fbe57d228bc798f97c8d42
font_01_sfnt_off000112c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 10932 bytes
SHA-256: 49df17314d9ff1aaab10d9aaa435cad0323edb282a0be704b6cb90f4518d5e61