Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b2ac428f5fecd9…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 16:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c7faa320ab2df4de630f8dc509138239 SHA-1: b221f15e0aee7a9944a449ebe0a2f65390c53fa8 SHA-256: 64b2ac428f5fecd93fc3946c28f7db091a3328190e2bd3c6e889786c30eb2ba1
154 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 0.5563

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://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/mejrib40bkltr9qvn6c70su89h/66215919248.pdf In PDF document text
    • http://alfavs.eu/userfiles/file/nimapevegu.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/fujitinarigelavem.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/s6dhm4uucn0ll19v17gb234prc/fasal.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/patavoxavakumitiwexana.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210724214443.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3dd4ae3e07a6ef551bf7e8391fa453d0/buwupebegez.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/97891b0e86878a8a3fcaea923c8510bc/vadizasiwowi.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160adea3ebd8c6---93076042950.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/17892657640.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/38688595896.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/88644505261.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/bedesog.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160969958be98a---59332947842.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/bunotobajujunitumiz.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cf8969198---sowebinupalujebi.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/23171209694.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/9093476304.pdfIn PDF document text
    • http://bienbao.org/uploads/files/66808299838.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/46718690153.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/02953fe59ae5aacf9c49d7d74b2f87ac/witakepetasojakibimokisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cooling+curve+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_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD5 19080 bytes
SHA-256: fed8a179429f6217ef0beb6599a0040ab3646c00987a1959124468ff71bdbd8f

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