Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3694d8f1c44370…

MALICIOUS

PDF

78.1 KB Created: 2021-08-27 16:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 99467dd1103220b4472393a741f47c8b SHA-1: 8c3582d72b0e9b3d5fb240dc379dabcef87c0fc4 SHA-256: ef3694d8f1c443701bffd4aae908bde1a0aff3e41c19a71ac6503cd5a473b0e5
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the overall structure point towards a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://dental-forum.ru/userfiles/file/lizisitorepupukigovebub.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d629474e8---fogitajat.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/4d22ea1643914625554dc4b71ec434ad/72062256022.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/86749996264.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/44371442668.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a74a3249d---fisitesanutamat.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b8de73cf7---34707003157.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/27ea1065cb9cbe86aceff2c0c2161496/65871886056.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9bf648c63f058f5b4595a21ca2cbfcb5/rekitov.pdfIn PDF document text
    • http://talleresjpg.es/img/file/linevikeraz.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/widuwikixuvexe.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/8bfa691250f790f8fa281cee9f31706b/gibaxixemipu.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/dumaxixelubuxepibexaw.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/0fdd508c1f9ae81abca27c07a025c79e/72225924957.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/kitowozof.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/70586834212.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/5117a2690cd3201614edb48253b84887/dorus.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/xateko.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5ab8965d01944f3ac8e82626a73a98b2/15697940089.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/xepuzuv.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c9267759a5030794fd0037abcfeb38b7/57902944786.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/45182573572.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/iqla6pln9vbeqcg2ashabofbl5/59556345244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+dungeons+and+dragons+novelsPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB5 17552 bytes
SHA-256: d41faa192d1c56521c88e55fb16faa1081b28b16d3561c9620cba45c373d1224
font_01_sfnt_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EF 10548 bytes
SHA-256: 27891479009454167f0b9c29d5bce6b6dda2d4ec20571123f2f65726bfe8f6b7

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