Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91afe88609cef32…

MALICIOUS

PDF

85.0 KB Created: 2021-07-16 17:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 15532baaf959336c55ee59b181de62d1 SHA-1: 0eeaeb70f4ee703c40fd689dae1cda011c4c9d85 SHA-256: e91afe88609cef32f313e4da807c6acf9d823c90e5cc0dc421bbc259a74c5a2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 0.9922

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://oceanflowerhotel.com/uploads/image/files/87608311351.pdf In PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160811daba43f6---12510549975.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f85ec58a---33987347841.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/87e9f3dc901837923c647f829e8e5999/gasanoretagemiwamaja.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/kodizonitevirajonoke.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0913a450b---4350097298.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/8786659839.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/1754f56e29d83b77a1084640303f159d/solibagamiduvefixasim.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/13691598460.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/krvti7i2v5mn5f2ad8qsetqt2t/tesud.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/bf2018968e5dd11601821a3e5ed1e0a4/79537581840.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a67fccb8ead---diniberosunibisizew.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160708b0214a38---sodarituniki.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/24049370106.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/49a99921953bbaad0326bcd0a3de3af2/29977870251.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709e6eaae1f---nawakotolepogex.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/rulazefadowigazad.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/9tunbp1968kuh0mfqdd9i9eddj/65881966114.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e616b7f0f60af3534d88c6b189a18fee/336772962.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/javigajulorunidebizutew.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4636bbed0f003ce938df782fc4e6bab6/4703397676.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/0059f72b58f247239b9c055a6873eaec/16317376167.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/72407928297.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cda726858---pexavuguwifonojibew.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19de9553a---70004368408.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=transport+phenomena+problems+and+solutions+pdfPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 10964 bytes
SHA-256: 23807e1ab0ca33ac489f5b6094ed99d2f08d9e3c9a59712529785de5b3c77612
font_01_sfnt_off0000eff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF2 19256 bytes
SHA-256: 332721f4415604ac88f725ca7b1606cbb2393425dc64efde4ba1d55287941092
font_02_sfnt_off000123f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C08 2712 bytes
SHA-256: 8f9477a2b6e094bb91a4fdf8b7ff061b55cab6ec3af4108750494698c1d3f3ca

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