Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f8c05793ff6d1e…

MALICIOUS

PDF

72.1 KB Created: 2021-09-06 03:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: bd99a7fa13b1341ac850d5dd85b16738 SHA-1: e081abb262f474b7229e6fd1c025f4154e892543 SHA-256: e8f8c05793ff6d1eecefc157adb805e5f3b29ba45d340e8fc5c717117f33a01a
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 0.3676

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://giverny-bkk.com/upload/files/13092569644.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16121a971a48f3---68046689559.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/tamuwalupitiw.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ade1d53e84---86336271130.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/67437174170.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f4754615f---16247553390.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/010e3cda43682eddfe2591fc7941e17e/40862494405.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/84741054987.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/84572677278.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/dawoxubonavopum.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/2fed456b018684f089acf4e32929fb5d/32505911843.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/sazagu.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/xetizudokewezemezoluz.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/13847272466.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a567026065c---ligosadezawevofemeneno.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/7f08227c5c9340e8e8af35db115a65f8/76528121559.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/mebazago.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/tm6e01ft46csesm7cggehu0j8m/savuvebilavalelulojadotu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c31d5836270---42192706393.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3efd2eae8---xulusog.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/70457493346.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/niwaxeredisosu.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/a6p22tk0d4j3b34hgp63637isn/zijewigejuso.pdfIn PDF document text
    • http://envigest.cz/upload/file/18754250740.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/06/26/latupidekupusiruxupade.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/1f1c6dfa82f45b26f8e23714bfdea8a5/dovexolumuvurupazume.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/5eg1dkmua0e95gd9g4o18sk7u6/46218968392.pdfIn PDF document text
    • https://atlantidegattico.it/file/kojetilar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=handbook+ceramic+tile+installation+pdfPDF link annotation
    • 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_off0000c909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC909 16472 bytes
SHA-256: e6652050e8637a17aa44db30d1773a40f8ff214f679f0f3813f258bfe0df975a
font_01_sfnt_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 11004 bytes
SHA-256: 60d378af8c44bd076b5475e349ed0dfae1a24598c9406c50968b3a7d0957472a
font_02_sfnt_off00010d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1