Malicious PDF — malware analysis report

Static analysis result for SHA-256 e454ce2133ff0acd…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 23:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1b54b937f7ad6aafc66491fb104ce10 SHA-1: 00bd0f0617ddc8825c1003b71bf4ee52dad330c2 SHA-256: e454ce2133ff0acdb9e07a247ccb838c6e4b69f0299425262c5ac5bacf163e92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many distinct, low-reputation hosts, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=android+restore+after+factory+reset PDF link annotation
    • http://ambulanceservice.pl/userfiles/file/gugudimigokogedejudidana.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/dezajiduxodirad.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/perelilexiwojaxirisobo.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/zibisirebowuna.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d9628d785f710404c899ad6ffa47a498/37555292930.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/modamonuxetuwukuxetop.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/44796881742.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/lususenizel.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/81021899380.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/75528296919.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/88020270969.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/duguzoxalamadapuviko.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/neduxorigevodofewis.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/mifima.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/renuzedakufenuzikuku.pdfIn PDF document text
    • http://abwessex.com/uploads/files/tamomemomajaseleforizuki.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d3a8d563f---49059257123.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/24787232186.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/bakanenebajosepogofobuf.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/zagafukarurizerovufas.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/10215401569.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/voketajasigudile.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/bajof.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614046c43c415---pafosejepurerilutokoman.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140a10006aca---60992995378.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2B 18512 bytes
SHA-256: b0e3e2d9a5077bc91147d1d82f062eed54a44341f47bb8e874ed1ff4b1963998
font_01_sfnt_off0000fede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F5 10516 bytes
SHA-256: c249dff85125a31644df5e048b04c34a717d6c03c6b95ba6589fe0f465391e08