Malicious PDF — malware analysis report

Static analysis result for SHA-256 be87491087998457…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 10:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b8c82ea6c5756efc981f4e448a0cd74e SHA-1: b875fba9c844965633ae9f318cdcdc79f7948148 SHA-256: be87491087998457bbc2482e28de535fc625f107439ea5ba1e960940a27ea02c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612a5f8c65c24---21957364595.pdf In PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086f67fdeb91---82994681030.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6636a66a1e---tizoromefogibulu.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/zaloj.pdfIn PDF document text
    • https://ikansambel.com/contents//files/29275353489.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/vekodoxexedonofozujedoro.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046981b6ac---gofazomeja.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202108280423379951.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/1591789bddf07ef34ffbc08a7b7c0f43/45286290225.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/joxifusogevusuxul.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/vule9jc2l1u42h1jv5jil431lo/27796335976.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16105f5f88a4af---kosevideberaf.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ff23105cc---zalopomunezo.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/1002720813.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f099c3516a---kixukobefexokumubuko.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/57483880898.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/panurifasidepatones.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606c964021ca1---zazixuba.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/91887794785.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/kirodafiwasalus.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5b498992c71c511cfe63ae271bdf82c3/kegamole.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ks411bi45hukhujl5mq6oiqkn6/31344170225.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/92363157939.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/95664302149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=dissecting+aortic+aneurysm+symptomsPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/25295262652.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 10884 bytes
SHA-256: d6cb7a70d3257fa24aa7350191c8b2cdc01194453c7c7ce007f3f9b2e8dbf8b7
font_01_sfnt_off0000fda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA8 17888 bytes
SHA-256: 9e5949cb4094f48e8a55693aea786173b41d597ee566fc8de7e4291eed7cd806
font_02_sfnt_off00012c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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