Malicious PDF — malware analysis report

Static analysis result for SHA-256 38bd0df3d5eab309…

MALICIOUS

PDF

83.9 KB Created: 2021-09-03 10:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3aa67779726ffe3cea1bf67b1915f240 SHA-1: aa857057cee8f8be8c591059a332c0954fd3e4f8 SHA-256: 38bd0df3d5eab309dae354cb527c2ecfa4e4faef489e45b7c8b43c754384b9d0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and compromised CMS upload links supports the attack pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79fb4c7ca---80556064939.pdf In PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/29075369534.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079ce97a810d---83997871235.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/56146444127.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/vitisesidumoxugiva.pdfIn PDF document text
    • https://webaprint.be/img/file/nejipibix.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/biziwojodibimato.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/basagegozineto.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/sivekam.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/nt27j8tha8h6sjchf6ij25vgv5/6806710484.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/vumekabeforeja.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b00210744e8---84090055424.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/perijivavatoluwevino.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/pakomiwexojuzibapen.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/16824127618.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/fibix.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/gufonigufukotugupase.pdfIn PDF document text
    • http://stylekd.ru/files/bogega.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/depiraxerir.pdfIn PDF document text
    • http://aps-mes.com/files/file/65237874633.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609947dcb198c---ritizoriwatuvofeporanama.pdfIn PDF document text
    • https://mavibusiness.it/file/jedigobabefipo.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/45143451530.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/5cc6f12370fc08ab615d7fd88ebb6506/kefunupavabanufuxekorug.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d15d0b882b3a7d5f27e1e0a6e2e3c24f/48332607368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=keysight+34450a+multimeter+manualPDF 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_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 19208 bytes
SHA-256: 10b585e81df7854c4e3bb633bf3a96add430047201136646c8c331f93053bedf
font_01_sfnt_off00010faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C1 11148 bytes
SHA-256: 8e5eebb91b9ed728907394ad3eec0433e78fa0478e5d2ec9aa9cf9b6881e4148

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