Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51ba5f21036d91a…

MALICIOUS

PDF

137.4 KB Created: 2021-09-02 18:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b0813f2c409f8f7dc4a04fd9a415d13f SHA-1: 26cdc107e89cc8ec9f91caa2d34320710a8b1e28 SHA-256: d51ba5f21036d91a808a7b7c3a4e0fb8e25d666ef0ef81bd8f38005934db0857
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a distribution mechanism for malicious content. While no scripts were directly extracted, the PDF structure and heuristics strongly suggest it's designed to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8720

Heuristics 5

  • 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
  • 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://imssp.by/data/images/fxeditor/file/71690779848.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082a372d3bbf---fifoke.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/2764b45f275064ea1c7ebd73e0b42d85/47504626592.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/b4g4asegbta3hqmnkdu90ac7o5/tebezobuduvatolamoromupe.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b74cdd933a8---vixojafazan.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/40857519155.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/64410760923.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/kamorukegimofe.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/52345767917.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/bivejopagewiwerumuf.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/33590598394.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c5d11c2c4---19876797224.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/tuxijifusavi.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/18454246394.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/e58bb93878da056152a82029da2acdee/47317167632.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/fujapalavagufelil.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dad00bbdce7---57171119402.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/rovakilebamet.pdfIn PDF document text
    • https://12shio1.com/contents/files/sifiwifeze.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9301a72cd---83549216335.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/dibugivadomitar.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/cacpb39rpj15891ph9pm3oa6gj/43750394506.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b51c1a43b2c---49370514013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ncrb+report+2018+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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