Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6b4f0e28d20bd1…

MALICIOUS

PDF

71.5 KB Created: 2021-09-16 16:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 167360e95a3594c63795ba9cb9c43d93 SHA-1: 4830a1bd43ddc12f05247eed27b5ff09590777c1 SHA-256: cf6b4f0e28d20bd11440d029a01d061657353d138c6c6e36ee89cddba1c59af2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware distribution, leveraging the 'how to transfer messages' lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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+transfer+messages+from+one+phone+to+another+phone PDF link annotation
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd36df283---67691366874.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/10lq3j9dj44km4shvlbm2vpjkq/seminuzivigofuvopi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbf381ef0---88863710519.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/23325244858.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/mejewigilizapisibuse.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/mevekazinagepufi.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/desejef.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd8eda1f62---jarapafadudubiripagak.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/29053900928.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/72702382088.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/63108061384.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/48455119103.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/47379043891.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/daxepibesabus.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/lasakagezodolanegabeb.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/87024881496.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210910083133106.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/22428904655.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/51074663085.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/suporivori.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/xibumewajumilufetaji.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/90994271614.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f4574000bbb90d40dedf2aa4383c3eaf/42369367416.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/16634102071.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_off0000b736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF48 15768 bytes
SHA-256: 30f7668b70dd132bc5c4075f1c6a20420f01b3c60617bdb5b7b2252a1e4ef9aa
font_02_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 10744 bytes
SHA-256: f57b65aecc83e644294a47e4d86e4f4c646a81b3c86cb1cb08e5f3e0f152f4f9

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