Malicious PDF — malware analysis report

Static analysis result for SHA-256 558698d8a3400b95…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 16:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a64dbfbc02c0b667082ec7155dbbcfe SHA-1: 642ec5aebaa208316d9037c82faabc2f33c1e59a SHA-256: 558698d8a3400b95acba70ff06c2bc5754d7eac07e6e99bc20eec60abc37a550
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a malicious document lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://zoomkish.com/basefile/zoomkishcom/files/tuzuzibugi.pdf In PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/363bd7c4e2e0e35e275b1b95cb8e6f11/mejeg.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/jidavexejixatezegareresi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835c7626205---jimuvefilusekemazelux.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/58dc6b9898de871f7c2b40c5968a044f/mimazebopizovulejironox.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160772c5e8c4c8---88121593688.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/cbaa4cbb61c11b1a3f3d7f8dd431ce0c/kasoladoginebemukixo.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/tujiko.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/43987084855.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e4da3abb---vesedoronizofigipo.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/waparavopabarotani.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d43dd01efd---6504880850.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3eded928896dc41ec400bbf23e7a1c89/tivopa.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f854601f---34465074712.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/jepulurebifadumosi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd1f34fb39---56555006403.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/velutatulopunedebola.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/b7ri16il65aelaevj2c6qpif9q/nenuwivabowimejegiboxa.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/zasufan.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30755873543.pdfIn PDF document text
    • http://vce34.ru/attachments/file/12572977369.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/getoromonuzapobina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=us+penal+code+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 17932 bytes
SHA-256: 28810772ccc2c18178e78267e56c3f6eba125dfb87a13849f720d163ddd0c7f4
font_01_sfnt_off000109f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001220d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220D 10328 bytes
SHA-256: 9a9e28d87820d7041cb34dc040be54ea9261d2defcac4a35b078dae5c019b769

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