Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a00b2553ca59d0…

MALICIOUS

PDF

64.4 KB Created: 2021-06-24 06:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 83f8fe6e6ef01ad701d8044d1c673f21 SHA-1: 29b9f6f25f9d59ba635e9a04fe9e7c0de23d88f2 SHA-256: 04a00b2553ca59d018034118737658d1d19c9a4e0084fe9ccf4f135193d9d709
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ngk074v5lcl1cjbavjcga94dl5/43987630031.pdf In PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a036f63db65---97993909944.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f5f323dd2516da9dac3630a5d4df87e4/98989684244.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/62902703264.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/kobosusuki.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/b34c3c4eabd0ef6b02c5951585b8b1a9/98286881720.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/5708e1f671fb4a6ea6959c17d06b577a/nepozuderopapebenutelexe.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ff0c63a92---madivofexipenolebiz.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ee2a7d56d---borogitagozarebo.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/gutimiboju.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/kitawadir.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/62c7148bc50a99e5f0d73ac182f6a48c/70399757694.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/v5njjk34kab9qpc1thcdm344ch/58957505146.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/85121841847.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/20380043828.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/37694199049.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/be96abb1ef33819f32e66e9f2b53980d/31511907547.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/zuvatijidi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=past+simple+and+past+continuous+exercises+pdf+2o+esoPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB425 5384 bytes
SHA-256: f0bdaa88e40c97e4472ec65d1ea1f63035861e38c526fc616c1cf7ec61c68195
font_01_sfnt_off0000c650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC650 9628 bytes
SHA-256: 662a38cb539736f9dbd6217d484dc91fa280ebf6dd9675e1a36bfd532275a596
font_02_sfnt_off0000e627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34