Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c4e2b642c0ef3d…

MALICIOUS

PDF

71.3 KB Created: 2021-09-11 14:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29df783e2fab15280f0320a7cb63a332 SHA-1: 35450417364f8fb557f4cc03de627a3da036ad79 SHA-256: 12c4e2b642c0ef3df243c3b62b9ac1ca318443f490ce5c78de45492391c47b96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate the presence of a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of a client execution vulnerability to download and host further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://scvumaichiramen.com/uploads/files/xipiwitajeviwiropenimob.pdf In PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/bimokijizudasajuwuneja.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/92077989496.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/73995098513.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a183425a41f72eefd15b632d48d68718/1308145800.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/5718505287.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/sutatalewitim.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/87048332539.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210909013021.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/ninuzowo.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16130cac247430---mafesoxutudatamama.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/80190883482.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/55852814501.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/27036786282.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/24132296725.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/12409519660.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/fakoboritevoxawuda.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/rofewaxamov.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210902142433.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c144c8d64b---remanas.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210905_012517.pdfIn PDF document text
    • http://yejida.com/userfiles/file/11527576275.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/17100141698.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/repodewenex.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/62e5e30540c4312d8a55e33a6b532d56/99403122910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=net+change+algebraPDF 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_off0000b8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AF 10244 bytes
SHA-256: db4b11bb12899d3af89c12976e2d242843250386b271cd31e3d2d2e4dbbd524c
font_01_sfnt_off0000cfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA2 15972 bytes
SHA-256: 99b6870621e1118cf97332d97a2955b80e65df0b046b242d265b46a7d1b852bd
font_02_sfnt_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.