Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c74f75b5bad3a1b…

MALICIOUS

PDF

75.5 KB Created: 2021-07-30 09:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8cc9f1b9f09e1b25edb6c567afa5a03d SHA-1: 60ba10d1c3faf2e6b1000f5e4857f4ba6c2d2507 SHA-256: 7c74f75b5bad3a1bf7357f4ba92ae7b9d7ce8a1fc7f8ab7b0118c5375c665609
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ekransamara.ru/files/25372490913.pdf In PDF document text
    • http://smartarts.bg/userfiles/file/55194129505.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/20179869755.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc0740ad6---79536297522.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831eee50791---pakife.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/qo1esp2doctkdrrub6gjlagk7s/fafidaf.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/io80d920vjfqi5km8gcnh7ps35/sonumaxokebobufi.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/jugabedu.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/lumeg.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/bcc21358061a9752828f37468230714e/59691391221.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/a50a62575144466a8b6f783db761f079/50213727342.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4165035415---dewesasukobuwefekagaba.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/72834302285.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/45642794439.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/31961279692.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/02/texagekagiluladebo.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a3ec07dc4---kawujegitirutixutaxonew.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/67663018358.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/zufujexavitot.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/bavezatoxusinigidifevipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=visual+studio+2013+express+for+web+update+4+downloadPDF link annotation
    • 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_off0000c33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 11432 bytes
SHA-256: 31474f4c266b08e9084ab4cafaf85d9ec8fa0cdd500019e2eb694be4f3811ccf
font_02_sfnt_off0000f66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 16388 bytes
SHA-256: e1a82434ce409d6e6e738fcc100512cdd29bc906d7d5988b9c01a4cd1008a376