Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3559fbfbf5ba57…

MALICIOUS

PDF

70.8 KB Created: 2021-09-05 17:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8f24563032cfbc7ecb8baf47b31199c3 SHA-1: cc361558f36e0cb9c663e918a354223e9d6725bc SHA-256: 8e3559fbfbf5ba572b7ebe8aeece2401d6b33ddd97ce61a35c97632dd5da8746
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 malicious score 0.9909

Heuristics 6

  • 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
  • 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://blackivy.pl/userfiles/file/xakutazexasokewo.pdf In PDF document text
    • http://roycraft.ca/userfiles/file/3020338723.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/38744141921.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/99913088328.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/midisisagabugodisa.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/ad0547a7b586e5889fc949653184cadb/lurilemuli.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/58759348629.pdfIn PDF document text
    • https://actorconseil.com/files/file/xiwaximewikozulukujimu.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/6198092374.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/joxirugizafizaxarelarow.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/v611arqc13hbmqtaue6nr7759f/94768214207.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed50d5f8e4---giribak.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6dbec07b3---kanugojirozosu.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612cba7dcb4a5---nolegedoduzinagaz.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/24469807090.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160908bf85d251---33307442706.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/lalexipiwe.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/seuloh2qau5hiv602306im82b7/22124449047.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/vomikimuzeva.pdfIn PDF document text
    • http://lyshiying.com/d/files/dazikigosituji.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/sebonofagarebifitogiruvo.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/12071661872.pdfIn PDF document text
    • http://anm-av.de/uploads/files/72627181506.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/zutogimovojosetirenati.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/totezonixosir.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/rofije.pdfIn PDF document text
    • http://poultech.net/d/files/68057366553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=rpa+governance+framework+pdfPDF 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_off0000b7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D1 14496 bytes
SHA-256: 2a090401996cc1468c1f885158cc80f2dd8e0d7d955be446ef500a3d8b6418da
font_01_sfnt_off0000dc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 10848 bytes
SHA-256: dd32f598738762959c339dbc7bd19ad6f086534d05a8db96342a0cd6d1fa6892
font_02_sfnt_off0000f521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1