Malicious PDF — malware analysis report

Static analysis result for SHA-256 31eb0a35e1c8a0df…

MALICIOUS

PDF

84.4 KB Created: 2021-07-30 15:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8415244127341ee6d6f5117d7e0bddeb SHA-1: 21907df2ea03f47eaa8653b20c8869a935e683a3 SHA-256: 31eb0a35e1c8a0df5bd44fcca70477c42f398d3833968bf9b69e7dd254825a65
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this malicious intent. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings indicate a malicious document likely intended for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3962

Heuristics 5

  • 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
  • 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://pistant.ru/uplcv?utm_term=personal+and+impersonal+passive+voice+grammar PDF link annotation
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea01a386a0---tufalokujuvurew.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/39083529462.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/22971557403.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607c778349e58---zekazepokinefid.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/74643098854.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55f351d540---8883203923.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/81182171196.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/45ae683a08a8f649c62be741ad930672/xosavomotukis.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/litilelikasitetimesebusal.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/gefep.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/07/file/ninelizomo.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/d9858dd9598c9c56bb9492d49013c402/71677740607.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/kugituluxerasedilomi.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/fegixolilawilapuso.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/da81bb36e3b5eeed70283af39d9a34d4/kugejixevoluzogewi.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/bdaf79da836ee07249dad89a6dbd271e/novodabigasojolujud.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/mizoburas.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5459719867bb8e392c65dde2c417698c/dipexepesimamoto.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/sekikaxusamaxu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f09ee10d6a8---kawatixepi.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/90464724357.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c920b40a715c16858b32d092ac3cfb0b/58207619525.pdfIn 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_off0000eb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 19016 bytes
SHA-256: a9edc06b1c1faeb72089f37b76a88831af1c2e02e848eda4aa685e245088dece
font_01_sfnt_off00011b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B09 10824 bytes
SHA-256: 10f44a48316a5d8ce9f1d42910f96785dd40cef5eb88dba61270d9e73e66db32
font_02_sfnt_off000133c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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