Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbaa042014ea9b39…

MALICIOUS

PDF

75.2 KB Created: 2021-06-11 06:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0d6ead78bca16b9d84ed1e8d5b10e63b SHA-1: d7f42da9bb287a9a6982c5ca0116712120fb9a39 SHA-256: cbaa042014ea9b390d7b4fe0674ee5826459f51172f5c23456de2934e9e8e5e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution campaign. It functions as a link farm, directing users to various compromised WordPress sites and other domains, likely to host or redirect to malicious payloads. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to distribute malware or phish for credentials.

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://nomylo.ru/uplcv?utm_term=beyblade+burst+rivals+apk+download PDF link annotation
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/d2693d151747bcc74a7650de070712bb/tifezevekazowo.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/fd9ee2b8758ed6b0511c2900e0032e50/93775747598.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/1b8231700f3b96660ee5f9f717a09b70/melemawevi.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/1017579135.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3859b8b36---18816262705.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/zedanixokajik.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b80ac11391b---madetidukorojimulu.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160abb77a28788---20105005580.pdfIn PDF document text
    • http://vo23.ru/upload/file/peruporebobopiduzaxofajif.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/4685327760.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/2aff9e846c3f1c5bc91759f40017d4bc/11852445792.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/96401ff84e9e7ea9a948a0d58b658aca/fenaruraledakusoj.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/11d38fcb57bc36ac817b2a911ade2c36/dikumek.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000101f1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x101F1 18700 bytes
SHA-256: 3265fc82cfa1c54421a46965a9626fac81ff0e76ca67d35c75fab3fdf72ba081
font_00_sfnt_off0000c97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97A 5460 bytes
SHA-256: 26481038af2ef71ae84cd7568c3f4e087630403478ab76d400f49e32f7adf29a
font_01_sfnt_off0000dc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC34 11200 bytes
SHA-256: e47a8a68d1e616b177e249972edc2e8233b4c37a287a7aaa6b72bdd282e45ab6