Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c20ec0be7a470b…

MALICIOUS

PDF

68.4 KB Created: 2021-08-30 16:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 10069a5279f72f8194425aa1e000cf01 SHA-1: 929fdb7becd2ed3f10c03fbfd2db5cfcd558aaf1 SHA-256: 68c20ec0be7a470b05477cc1b50a8c7ab331972fb77c65219457ff74c70432c9
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, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and potentially malicious PDF files, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farm heuristics points towards an attempt to exploit user trust or direct them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://exmar.it/foto_fck/file/nidukomujezofunik.pdf In PDF document text
    • https://lasanisports.com/files/80153247634.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0d7a586ae09813a7590a35e3a5133f19/rebumovipuwujik.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/26669540909.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/4cb638fd3fd0ef5e68dfe82109a5e5c0/tofapi.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/bde113c4851598efa8dfae1ce387c65b/77168472542.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a439e37745b3f9dd8a4c7393148e399d/78966677335.pdfIn PDF document text
    • http://jessicarossitto.com/clients/7/7c/7c16b8c799dae9ffcd1258f31d6ff645/File/marimafivod.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/3a585b12859a028aa92decdae5828963/zavutitasajifekaluxomekul.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/35403268881.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5babc7556b---92410604327.pdfIn PDF document text
    • https://digireg.li/upload/58446364448.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/58934992946.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/f86803fa820c8774d91f3e5ea83b471d/venun.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/48495858636.pdfIn PDF document text
    • https://geniodelweb.com/file/83818592593.pdfIn PDF document text
    • http://live-net.it/file/88242122091.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/pevavex.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/mimakanamodusixedosodopi.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1622302234.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/muvipomaronagim.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/puzuxusuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+ac+load+line+of+a+transistor+circuit+is+steeper+than+its+dc+line+becausePDF 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_off0000afa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA6 14352 bytes
SHA-256: 2c763833a0530609c76603570654cf8dbf717d8d10418614003e5357e820cb97
font_01_sfnt_off0000d365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD365 10920 bytes
SHA-256: dea9cc89c8d69d2f866d1337956a80478c9b559861ea8c9ad8b213eac6ea43d4
font_02_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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