Malicious PDF — malware analysis report

Static analysis result for SHA-256 24df8e8a1e1ef937…

MALICIOUS

PDF

88.4 KB Created: 2021-06-13 06:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5fd0445f656f9e6fbc061fc8b505d74c SHA-1: 7c6457418836e6ab97813fcad5bdd4ae18aa5608 SHA-256: 24df8e8a1e1ef9371b82ebb174f0b754bb9e5aa7b78884522c15212820568445
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 0.9996

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://huntic.ru/uplcv?utm_term=garikapati+narasimha+rao+books+free+download PDF link annotation
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf4a50ddb3---89092346217.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/373b97c276b58b6bb3aeb569bbb686c3/gojimutixawiki.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/8b116ba3a9c073c5dd57ee1ed9a8d4fe/kufegu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866a8dce1c7---gomonozeketeviji.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/keq5l6j8f43iu2qk9bp1u5jng2/81197074625.pdfIn PDF document text
    • https://papiratisk.cz/soubory/68690736102.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/81176989923.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/afc095c39e9fa515e7af2a44054b35a5/perisuzewulit.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/u4n0p45rp4hg695l7nqr1t13et/negosizof.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4f003eeb2---jukad.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847ec3a4d2d---zokegamil.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/91621611481.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a27899f5f0f8bf3cdbcfae6977cbf67e/lerirowowejozexufale.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b1fc85faf984fb8f7741e8f1d60eb6bc/mipeniz.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/943fb03099e7fcc8b4b02b7b3997b2f7/nebozu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607722c1c9503---tajomul.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/69684319551.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 5608 bytes
SHA-256: 70b5a7649d64a9ff291c897938ab943e63db416daa98c00241cfa6fa815c7600
font_01_sfnt_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 13724 bytes
SHA-256: 965994583efd7e4d542e800c1765888d24396195535d29e614fc9b0acc51647f
font_02_sfnt_off00011706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11706 11548 bytes
SHA-256: 0c5ce0cbaac167e08b5ed840cfdea2b824a923428331c1c5012f8b2062d3f6c7
font_03_sfnt_off00013e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0A 16336 bytes
SHA-256: ff8c9b4b2523fe0ccc83ac85cccacc14cc29c5053bcbce974414449af777fe57

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