Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a63a097e2ceef8…

MALICIOUS

PDF

80.4 KB Created: 2021-08-28 23:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fcfbe0cbaf4b45b392dcc2dbac6e0865 SHA-1: b2891b395d492865881ec3fa2e4eae55c253aff7 SHA-256: 15a63a097e2ceef864b41864d18fe7bdefdcded1a4ca8b76af70e9c0dcbee39d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous links pointing to compromised websites and potentially disposable hosting. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://energooptima.hu/upload/File/pokale.pdf In PDF document text
    • https://travelstore.tn/userfiles/file/fudaluduwozakuposux.pdfIn PDF document text
    • https://ikima.fr/uploads/file/9936430297.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607631e0339af---piveb.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/73804576972.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dff82ece83---zedanidagezazupufepijido.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/788c7ad70b1c685762c2f30d343d3342/xesixorewobidogeleduk.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/liobn4nbqsdlsuo9cpvi4h7736/pumufu.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/sigoze.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5898d0e65---16852101991.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4ca21afa21bbf258d3d1595c46544d95/sirajekajagilo.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/695dcf9c6f5c6a810980158ab2b3820f/96610500231.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/44215004013.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2d97a20f---43267822099.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/40464298568.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/7ilj9rl7932emjiq24e9iprm57/fonavitujo.pdfIn PDF document text
    • http://blatt-gruen.ch/files/6793068958.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/mopag.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/80528553684.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/fapafovobiduzo.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/19590930875.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/tojifujisojosav.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fec2ccae8c---nogimojejudowixiwem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=investment+outlay+meaningPDF 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_off0000d657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD657 10584 bytes
SHA-256: 0b35588a44f7fe2d741e4f8ecf1f02a976554fa8096e8ecd01ded836e7cb691d
font_01_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 17420 bytes
SHA-256: a5771604bfcc4caadf9be60541371c9639d46fd3362cc7281ebeb069af0f6d80
font_02_sfnt_off00011b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1