Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce147e2e47cf8a0c…

MALICIOUS

PDF

90.1 KB Created: 2021-09-07 07:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9eced012134658404d59a822c66523f1 SHA-1: 38d448a95ea32b18f0414181781d113348945260 SHA-256: ce147e2e47cf8a0c22f14044039e11d1a3a43d3f8748c9eb8b112b06888d5ad0
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed for SEO manipulation, and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM suggests exploitation of CMS vulnerabilities. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or conduct phishing. The embedded JavaScript is a common method for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 7

  • 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.
  • 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 https://queure.ru/uplcv?utm_term=german+language+course+a1+pdf PDF link annotation
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/dd971de03c1a2655613beb6bcbab4efc/87430351110.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/78911888727.pdfIn PDF document text
    • https://emmaushuis.org/pages/39788678228.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/80686409144.pdfIn PDF document text
    • https://topupdana.com/contents//files/zurogifisoroli.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16110b8256999d---losajeguve.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16081a9412e4f9---lefejimewizuwewupume.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/josukadodemo.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/folipewagomeluluxiga.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/jevuwarixipagula.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/66743512427.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa36aaa2d4---jipinumewotavuf.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/devugu.pdfIn PDF document text
    • https://sanagustin.cl/files/dotapo.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f89e9647ef2---nixodulopugilobedidum.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/8598713db471948fcf35c2d8c2f7f93f/38810411492.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/9fk8ahiu8iqchd4vkqh7jakmp7/lekituta.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ad826cccd386f2c76ea9821ffaec9f4/funeralonizawerebajekojo.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16107a32b199a3---finiribapen.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/67553100242.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/80d115913b82692cc4d1a481592b1fae/rumogonaposufafozizil.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/vipitunasutun.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://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_off0000f652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 21156 bytes
SHA-256: 31be53e3437a925120e4879dcb43a5877ea5871053dba9793b1fca22cf101cf6
font_01_sfnt_off00012d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14555 10964 bytes
SHA-256: cb7fd3139cb16bf676410d2756adf4ef02a0f82da97272a991f6b676a9f57ed5

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