Malicious PDF — malware analysis report

Static analysis result for SHA-256 185356dc27b88d64…

MALICIOUS

PDF

90.9 KB Created: 2021-06-16 21:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e3d9c5202800c5f3495800bcfdf579eb SHA-1: 5c68d9df325f54a712ab732d341803a08e008293 SHA-256: 185356dc27b88d64ee180af29c07672f9eca9dbcf24ccc91517e619ef407be68
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of 'utm_term' in one URL indicates tracking, common in phishing campaigns. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing attempts.

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://ketchas.ru/uplcv?utm_term=wow+classic+horde+leveling+areas PDF link annotation
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceb3640fd2---77664307481.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/silirajodubo.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/01ac6d9a6d6fb24cf082718151d8a6c4/64559562427.pdfIn PDF document text
    • https://fallsplat.se/file/kiten.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/a97d837b3308ab62f4c98e801f9ebcde/xitenupokudirovisi.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/nazitenidumukubeweg.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/timexekitaniwelit.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085438c75d77---51273184675.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/kigogoru.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/norupirake.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b07a4351277---82641336884.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/04073f794c19b6937216c634216dab93/zamuvopafotowexen.pdfIn PDF document text
    • https://luminex.pl/upload/file/32599062738.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/05e1297bb1faea1b5bf080bbe4576a26/mopirula.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_off00012808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12808 5368 bytes
SHA-256: 71b1fc24b03985e373d9db1c7096fb981ddd19de266ae5fafd0a34b83845ad99
font_01_sfnt_off00013a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5E 11252 bytes
SHA-256: 080755c1299dc615b27424c3be704fb7d27ab4942bc0c6df5cc73dc9b5549b57

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