Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8ad6f3e91151f1…

MALICIOUS

PDF

79.5 KB Created: 2021-09-05 17:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 98629cf2e880ea9b4ef1257a65226756 SHA-1: bd185fb0dab3a53adc78a1f95a95a3f23fcebfc5 SHA-256: ee8ad6f3e91151f103875734670f2cba669d5690a6b5c162d11c3ee7a46eba2c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=ruby+scripting+language+pdf PDF link annotation
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba765b7b40---77776245040.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/lalelevani.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/64334968866.pdfIn PDF document text
    • http://metabolit.ru/files/file/niwakuril.pdfIn PDF document text
    • http://leguido.net/files/rafofovetisito.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/divoguriniluwexudanedunem.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a37fde649a5---gevosujolusemubolezax.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/79602312981.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/76430708373.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/77949876911.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/bofovafajiguve.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/bd0fa7713b96030b57b2fef481bd1c5d/16292253753.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/qn2eb4aev1i1b3jk6ipn9329v4/rufuzajimanajatifagepipu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6849a9cab---80676445457.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d60abdd97---mafotef.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/511687981.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/27857194288.pdfIn PDF document text
    • http://nicosiacaffe.it/file/92742115518.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/77267099167.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd9acdbb9d---85391260921.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/pitapojadixupuxizowo.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/jumab.pdfIn 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://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_off0000d4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CB 16316 bytes
SHA-256: 0def0cc0f8de7b4c3f1d5fdb4ac7fdcba978d75c1e13fafb32b7cfe7e0e79a0b
font_01_sfnt_off0000ff26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001173d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173D 11072 bytes
SHA-256: 28d83c3df76d47a6f6d4afedc9bb375ed7183c81b01d345b3dc1be2f1bb45944

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