Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4bac4a667314d3…

MALICIOUS

PDF

84.5 KB Created: 2021-06-15 17:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cc1c541f2b3d97a3ff18c0287e65c06e SHA-1: 42808638ed97a6da5afa9b9cf160ccbc13ada1ef SHA-256: 5d4bac4a667314d394e4e02045f0d8bd912d3387698f04a080abab75fb7b2934
156 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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://allytemp.ru/uplcv?utm_term=how+to+make+a+trident+make+lightning PDF link annotation
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0b97c40c730496719790792fd7f6c66e/gupevuwufusodarirojulejaz.pdfIn PDF document text
    • https://atl-50.com/files/file/69189727979.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9927677ba---xenawatinakifuzikufimo.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/58656086256.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/61688803856.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/d0a03ba154b87d3800d4a6afa3a31be6/rovumawabinaborifopapulog.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a8519932415---43483934163.pdfIn PDF document text
    • https://kar360.com/resimler/files/fagewexopufumekope.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/8595196191.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac353934cf7---53923570735.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4df617041403abaf6b7ccb9f1d347fa2/61147393198.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e273a56f9---10447744357.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0febd1b0b---41072804396.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7804fe93bc---5734898520.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/uggt1f3icgngnhhvl9p961mph1/vikofawekorojevore.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/6e52a0aa8cecd539390f0113501fa048/70956207060.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/984e97fbcb5c13e6e5ae34da105c3dbf/susadudidusugevofiwubaxu.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09feedfb7---49899452428.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC26 3188 bytes
SHA-256: 635b2a2e9a48bdae1049c6e05f2a520eef4710645dc0273a3b2dce473eb9e2e2
font_01_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 5176 bytes
SHA-256: d94ea884b145b17d079e3174bb0cadec306ad2ab2e041759c2edd292bb09e35a
font_02_sfnt_off000108da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 11164 bytes
SHA-256: c4360b935e07e9c0cb0e8565fc6704879f143548dca4d16d84f3aee103d5ca27
font_03_sfnt_off00012ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED9 16140 bytes
SHA-256: 1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d

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