Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9584f2e0cd98362…

MALICIOUS

PDF

71.5 KB Created: 2021-06-06 20:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e1e24e6988c0e31288236103dddd15d3 SHA-1: 0d5e6fd1320829ac2fce29fbc45498467caa91ef SHA-256: e9584f2e0cd983624e23ef599f8e8ab134ba15cd59d2ff1466ca72b792aa9590
156 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 numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The embedded URLs and link farm structure indicate an attempt to redirect users to potentially harmful external sites.

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://inwebjor.ru/uplcv?utm_term=hotel+del+luna+song+can+you+see+my+heart+lyrics PDF link annotation
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608174b6a25e9---lataje.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/52067739434.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607429544aaf5---rotexekoreket.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a824481da9d---zopugexepilejujudu.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/2478498215.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/c8508f263a02ffe1cbbea4acbf1552a0/81284045899.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160841c72bf670---gepebapububipumeluv.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f888919731---39254465959.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/5h364q7es3tpp5375s5o6rc4d6/1705994951.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094927b08df6---55849783387.pdfIn PDF document text
    • http://lawngo.net/fckfiles/19082151978.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865fba6a56a---zarugapovagoxodosigeku.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d241bd646---sofasuvibavixuv.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/defa7aece62011629b33aa1d4824b517/384259509.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609a73bc0489a---30829061450.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070728312f01---pevifinuxas.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/vamosawagutijepowepimov.pdfIn PDF document text
    • http://simonide.org/userfiles/file/womofeti.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_off0000daa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA6 5416 bytes
SHA-256: c2d7745e420da0172a95c17ccd095fe56fbabe68801286dc8aebe9d6b0d9c729
font_01_sfnt_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 10504 bytes
SHA-256: 4ebc396cd964a861bdbf880f599ec48a42bf2054cd7659f9795587b837c6c1ca