Malicious PDF — malware analysis report

Static analysis result for SHA-256 53df2b83935816a4…

MALICIOUS

PDF

76.0 KB Created: 2021-06-11 05:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c859f62161f00b80b18d121339647d3e SHA-1: 522ff6f44d5a82c36d7129e9a3cedcd4780185df SHA-256: 53df2b83935816a47f0f2d98f3454ef8115cac589c14ce617250a1886fb96e06
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via embedded URLs.

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://chcial.ru/uplcv?utm_term=preemie+weight+chart PDF link annotation
    • http://alkanboya.com/files/file/%5C/tametuvepimototuzibu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5f5tac4m0d11de9ra37aqsfpj0/84903802419.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/af1d0fc4f9bd2a6439a2dcf0c2659444/22059451679.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ucm6ko76cksr5tr7auldmdash4/widivagowixov.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c007230cbbb---17449662054.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/5ug7reqp5ni8k4svkc2tf4m18d/vilakunu.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/9sljhkoqel48c5m8kvj0kng6k2/degakojijogowujako.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16229981043182.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160988ce43b496---22533549945.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608082df5ea51---kezifipimewataw.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/937128f4f672302be4bd5294be7eac14/pigaziwumawazexir.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/boferotaworuv.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/sojuvanotatevav.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/davelopemosujadul.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/50023057013.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/34845321179.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_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 5096 bytes
SHA-256: c302a4868ae4cecbae81653db11091d37ff56e91f86a8d4e2c05e9d51b07f919
font_01_sfnt_off0000fed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED9 10684 bytes
SHA-256: 31a1c23acc152d8eda4c7d713a797c454137204e3027ff5f31341c214eb5ccbe

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