Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4cfdb088fdc38c5…

MALICIOUS

PDF

70.7 KB Created: 2021-05-28 21:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b5111682cdca87e26fd4677488a44197 SHA-1: b6494394557ce2901f2a2c0486f15d56886eaec7 SHA-256: e4cfdb088fdc38c5fc4f59e5fc3fcba115ea3a5571819a955aba297d3103fdcd
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing campaigns. No scripts were extracted, but the embedded URLs and heuristic firings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://wastran.ru/uplcv?utm_term=how+to+set+an+accutime+digital+watch PDF link annotation
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/cddc2bfddeaa346fd7a5d96719370dc6/22414851460.pdfIn PDF document text
    • http://fructusartis.com/i/File/fujagazatatupatape.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5be54f63---233949416.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e6eeb6c9---limekaludipiliso.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/d92tntlg2a3hgcjscdfr3sgo2j/80071943754.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/dd30616f45f248b5f84d7ddb3c92d562/dibomewosonogugu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/81b79b296805da11f8e61d3b4582d8f2/sopawokikiliremefiwiwigib.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a404bb501a9---fumarovujavekopeberujo.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855abee7dec---49238573003.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ii37cjvtmmco8cfeu1jjcgsth2/rugulogubunutozotelipoda.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/dea9a570fea747baaa985e36fb3ed605/mozefavebax.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/2878107685.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_off0000d7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A7 5308 bytes
SHA-256: 80cb48d948bcd1cb3485798052e8cf9f658da2c30e2a6a7eba724c8d7a90e344
font_01_sfnt_off0000e99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99C 10696 bytes
SHA-256: f571db07626940ef89479027376bc817f73856615da3adfd0b517296e65a8d1c

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