Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a86a1a99c0aae9a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 10:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9882f9bae26ae34371c2a9a14be8cd6 SHA-1: 25d99f61eae2a9b9e7a99ebbc9f6c9bc37f036de SHA-256: 1a86a1a99c0aae9a37c1005ae94f52369e1ea91a8814ef97394440964e26dad3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or serve as downloaders for further malicious payloads. The PDF structure and its extensive use of external links suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pistant.ru/uplcv?utm_term=core+exercises+for+back+pain+pdf PDF link annotation
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/kubijijijebenojete.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19268cea48---70053852587.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/86883826791.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faff6aa0ca0---85118821295.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a5f73ad4e---47778463413.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6f6be1d3cb858ffea66e77fd3c1f3aa3/tuwadedi.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/18318193803.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/bisejotonovinepudulotap.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27e8834c5---49043405856.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/wiparezove.pdfIn PDF document text
    • http://vhs1970.com/clients/873287/File/17256077279.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e41e9e7e75fc48de7d61a98250c55111/sezirixazanafajeduridege.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/39619231005.pdfIn PDF document text
    • http://jar-ted.pl/file/9612362081.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/bapasiduloxeboxefat.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d901275dd3---lilesawa.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/b54abd0a9d45cb9b77aaa2679a7d5495/2272970549.pdfIn PDF document text
    • https://rotherelectric.com/files/gumozuwasotutikosomegin.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609eef4cdc072---zilajunevaf.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/dedabewimoxesifikib.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071c6896a88e---zegigurutimibuvuradutonap.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cbe1ca98b---35490431179.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 16916 bytes
SHA-256: d2de95bd3fd45d7f3b7c4d2cc094c9c6d45350da966aad5f2d7bd55934e31801
font_02_sfnt_off0001210d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210D 10832 bytes
SHA-256: fba4d2adaba0a42522514eb8e867c5c6b1e3bf7ea893c437d6fbc54016f27472

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