Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee76dc106b4cc91a…

MALICIOUS

PDF

102.2 KB Created: 2021-08-15 19:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef8e007ff4c66d4ae3a69f51dd21d9b4 SHA-1: ce0c246359f7d5a8b40ca6590db55c5ae91b129c SHA-256: ee76dc106b4cc91a33ee27cc88242d806870991b13f2c6fe422fdb55e92d7cfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://laborke.ru/uplcv?utm_term=libro+de+matem%C3%A1ticas+cuarto+grado+de+primaria+p%C3%A1gina+94 PDF link annotation
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/8sra7t5uatrqvobdl3ercsvhq1/24046953305.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c66c794e9---2898909474.pdfIn PDF document text
    • https://actorconseil.com/files/file/sowodozaduvegomubis.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210518010615136.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d8716e953---javom.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/29133487252.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/26951845397.pdfIn PDF document text
    • http://beiks.info/public/file/geronavaxukejowagoropida.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c017a037c38---56174398420.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/53405117816.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ff65b7da3---bibeno.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/009d54dd26b055421eb7192f5b199b6a/84978042429.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/9866795072.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/60995221066.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/45351974106.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/79487419544.pdfIn PDF document text
    • http://turatabor.hu/media/3511158393.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609002f86c148---misekezigawojototem.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/46906562648.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/3b94af6ea00dda7f8e731524c48624cd/24974702049.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/58364107601.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/mibegonefumadepo.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/nenogofu.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/1967805879.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 11432 bytes
SHA-256: a8d90e738cbff015fa409ff0080f093ee8f6bc1f166176323da8f0cbdf03ae08
font_01_sfnt_off00011f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 18464 bytes
SHA-256: b03f66025a33aa4ef8be34558d76574554d9a5f8f6f20b1e76ab2f59c06d5912
font_02_sfnt_off00015003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15003 9872 bytes
SHA-256: 41b56e8f60d0a708dc8b14d87ccf8c4d369c445a75a3e77e2b0880ab2a3d1680
font_03_sfnt_off00016eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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