Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6855f5a79c8338f…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 03:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 99e7d83b9962bc2e44c6eeeae67b9dd8 SHA-1: d490fb5d97803df0ca0144a2ef622723360eef07 SHA-256: d6855f5a79c8338fc936ddb735782cc81fcc6941384e34eab101d10d649795ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to download and execute further payloads or redirect users to malicious websites. The document also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://archism.ru/uplcv?utm_term=snyder+director%27s+cut PDF link annotation
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4bc0cb0071587fe2514a96f1e2181756/guwawejixarafeno.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/66250779764.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/50ea5812188e6d6530061d7b0548dc36/xibejupusozoluruvusedad.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a6b728695---tafibabamerenozufoxifun.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/vuwakivifawavugine.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/zosinilaporozumezujeji.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/jimipotirovimo.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/vutedudisogexunivulumate.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/kowenuritu.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/22972919494.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/fegumezukasepanobunutalod.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/11515826099.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/27856065927.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1630508584.pdfIn PDF document text
    • http://langyupharm.com/upload/files/kojadazupawilinutuvoto.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/suzimoxure.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/juluwemajuvumu.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210927163904241581f95h0j.pdfIn PDF document text
    • http://gibisch.org/files/files/torikixajuwawex.pdfIn PDF document text
    • http://hoachattn.com/image/files/37628014158.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/loseduxadugedadibedabu.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/wofiwigatoduxuwituseluj.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/6750026551.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_off0000ae77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC689 15468 bytes
SHA-256: b9f0d60c214dd98fd82c4b8f9c61d2a6b544d96f988d82153fce43b29af5b770
font_02_sfnt_off0000edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 10476 bytes
SHA-256: 3f5702229c31f7bffa6e1321dc1b3c3a71181d55d019953d643354a84b474026

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