Malicious PDF — malware analysis report

Static analysis result for SHA-256 71452974d3ee4b7f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 21:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: be7ad6d9650361b1adaec358e0ae73cb SHA-1: a8b5a1666074e4a9ccfd099352da249c0c417f63 SHA-256: 71452974d3ee4b7f8c6c94c1b11219e843f1fde8720b97a3203f4adb880e0dbc
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4712

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 http://bearings-home.com/userfiles/file/mixefejisulapojufo.pdf In PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/9a11dcfe7c975e138b838f3cc2c5bfd3/1470194131.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3ea8a16f1384b45a3e2e8d7f8b928f23/51944947876.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/ditidupimefidabuferetum.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c292132ca80---sasadinujimidajirerufuvo.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/13909814702.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/nuwulivokulokuxumez.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/rilonisa.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/kopotapederisemela.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160c53e07b524b---92116150598.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/dedaxigagunonibirije.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202107092029538084.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087324c235bb---buduwuwenaveruzom.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/26795241453.pdfIn PDF document text
    • http://melabo.com/upload/files/51318416056.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904945f2130---dareko.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9ad7baacb---vepelinetojepujexe.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/40631331255.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/ralonisuwewuzozis.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4760f98b07---vavufo.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16081675e5e845---19686065549.pdfIn PDF document text
    • http://elskenecologie.nl/files/lugosiwegukasel.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/46245408110.pdfIn PDF document text
    • http://deasreunion.com/clients/860224/File/20230492441.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/60370027616.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbc1bc6b19---ropusejolexafibozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=hematology+analyzer+working+principle+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 17916 bytes
SHA-256: e6dc0af1ed4629955a11750d753f7da2cb190d44248cc36b29cc510b51821d2c
font_01_sfnt_off000132c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1