Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e0007d775f0e55…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 04:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b1d5fffab220055ae06897242d7d3da SHA-1: a1a727616b2771fd2dd25fad361a089a11439b6c SHA-256: e6e0007d775f0e55abdb3c99f0586c2268a55b2f2bbc56209c75a1530d060a25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The file contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting it is designed to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=fifty+shades+darker+full+movie+2016+123movies PDF link annotation
    • http://interstyle.org/content/xuploadimages/file/39481214736.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9ed2c6d3d1da3ea5702b04486c178690/jukesulimupawaritesalide.pdfIn PDF document text
    • https://uhcp.com/editor_upload/file/81914527845.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c8e7990e25bdf15f0a3f25341dcd01d/64751544894.pdfIn PDF document text
    • http://winso.tw/userfiles/file/89561630117.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614756a524c22---lawozi.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/60710157583.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/0ced78031a2caaf704d0438feb5eb6a5/fizovowivokad.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210914091706.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/vudajabukubijupavajume.pdfIn PDF document text
    • http://vuason.vn/upload/files/31665963116.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/69870871236.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/29289954637.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/65581561631.pdfIn PDF document text
    • https://akemi.ro/hirek/file/52111737297.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/88717694569.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/bewaxefotazowira.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/povubuwimenuki.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/dajamik.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/14711555002.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/64505577629.pdfIn PDF document text
    • http://wych123.com/upload/files/ragido.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/85155210584.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/tufogalofumosusu.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/fatezebotufijowi.pdfIn PDF document text
    • http://maulich.vn/attachment/files/nusokokozixa.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_off0000b471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB471 11500 bytes
SHA-256: 8dee5d5b8e5591d306b45fed71f1a2b02364d34450db08b28b50c750f253f72e
font_01_sfnt_off0000cfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 15768 bytes
SHA-256: b7609c6dbebc311a53ccc0e9176e0222fcec9f04a19f8094574f843e9e194ca1

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