Malicious PDF — malware analysis report

Static analysis result for SHA-256 668783e44b0c7c22…

MALICIOUS

PDF

72.2 KB Created: 2021-06-20 07:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 03cd02b9d61c7d114ad5459abacf3577 SHA-1: 63ea9fdf956d95cf82bdc96fb9232ba89df298d9 SHA-256: 668783e44b0c7c221a969a3107e1a896642499862ca04b2291dc652a48362a91
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.7291

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://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ed74d83e809030fdae07c92ba2b75644/7976468465.pdf In PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f384f104---31138164359.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609188868c3b0---85511835204.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c80481142---13968533235.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/7okcu54imhfqmrsqvmo85r2umi/86709573106.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/7a9162a5aa0e1475d49386e6a918c749/pewilutojomizos.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/69895914911.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/pozubirurujaletuf.pdfIn PDF document text
    • https://limsurdua.com/contents//files/35372942704.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/f8949b4b4a515c13e82b486c87a499fd/xemenokiwuxipizus.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af17acff14---58088308761.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d03ce898d4---toboxetotin.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/57ce0a019d6b65c834dddafdf69afc19/27807963296.pdfIn PDF document text
    • http://envigest.cz/upload/file/wovivufugefosarivi.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/13693664341.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/banomudaz.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160888f1c356c3---62111396543.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=caller+tune+imoPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BE 4556 bytes
SHA-256: f8b69f7853d328727a0741976c60109898c1c169300e73bf08ea23b49e1b5b61
font_01_sfnt_off0000d11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11C 7532 bytes
SHA-256: 5bdb5dcb3fddb951a89273a0b001de4b63e06e3c18d6e94dba2e5e46198b825e
font_02_sfnt_off0000e986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE986 2328 bytes
SHA-256: 2cc1e50f0fd6496c2ab9826068307ce5cc392e2c69d801942a645521020ee041
font_03_sfnt_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 10236 bytes
SHA-256: 1f144ecada4ce066fa3572f03940636216239feba1f1d19ce810ddd91f8073ca
font_04_sfnt_off00011709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11709 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378