Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ce3429f93e776b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 20:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 000128a5d3ba78ac849a14f7d213f1d3 SHA-1: cd3944453bdfe2036f66b25a3de7edf9c92053e4 SHA-256: 61ce3429f93e776b6a9f32939f7534fca7fa6775aa10f3a0daa313b4e85dbf46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates that these links are likely part of a link farm designed to distribute malicious content. The embedded JavaScript, while not directly executable in this context, suggests an intent to perform malicious actions if the PDF were rendered in an environment that supports it. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious PDF files hosted on compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://zabradli-znerezu.cz/userfiles/file/rajubukinumiwodenikemor.pdf In PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb931536f---62298354613.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/zugosobuba.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/s68qg5dll9err3lno3jnadbtst/duxadarimikomebefometina.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/61801128133.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/32801065368.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c55be16e289c5a274aba1607ec7b7294/dewamumoviwet.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/vodiliwibamodav.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/58432970324.pdfIn PDF document text
    • http://attlas.center/userfiles/file/najewusimopeluxujiferifed.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/22115532831.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/cmbu36re29cuirrunslrctgng1/bojagumamojivem.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/vogefefexegowexumokenime.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/jirujemekutavi.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/39868239118.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/pilokekibol.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/36772266939.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/df7368ca825e249f7d5048474b74349d/jogiva.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/95488949347.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/65287008276.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160fbdf0368b5b---11650667423.pdfIn PDF document text
    • http://honda-vo.com/upload/file/gutasekunawogedolela.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/leraboxe.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/15074f389088396bd9ff51d7d293a189/65586466973.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/39030231956.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/4a0ad206e134bdc17b7eed9910014e30/25128157691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=present+perfect+simple+exercises+worksheetPDF 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_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC39 10864 bytes
SHA-256: d8881ab8f675e5e7f30074cee3ab71071db84fd1831576dd726142edc51a663f
font_02_sfnt_off0001152e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152E 17760 bytes
SHA-256: 48c9fb0d0ccce148fd92d61dfffc38f054839106e0d5c5c251d8c1d111d871cb

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