Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4aa4ede72099001…

MALICIOUS

PDF

90.4 KB Created: 2021-08-08 04:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d412faa977c8a2ba44a9bdd6364b6c7f SHA-1: dca36c52be39bd553df830820861bb22ad9c302f SHA-256: a4aa4ede72099001faf7fd385ede71f546f2b3972e4e196da620d91fbcf80edb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://drafthe.ru/uplcv?utm_term=d%26d+beyond+college+of+swords PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853bbca8478---74114323927.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/gemokesaxijivofejuwutidel.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c0f31fa3f75f8e18c8f08b56f9be6f63/38962048724.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d246fab1f0a---mitusu.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ldn1ej8203lm71vopkg5iqt045/21957661649.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/01a22f701ea8ba01330277f7f4f020fb/99108551699.pdfIn PDF document text
    • http://stepsforstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/girupibujomuvoximanu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf7b42bc49---69747283923.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/0c70394ba91248669b65263d833b1266/kabofepovidokamifu.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/joxugovakubabudujizotajat.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/71422624151.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/160877cc5b0c01bf9fff6bf46cd7df7e.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/70581029507.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/92609579936.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e25a704f16ddbf86a1edb391a3922c00/gorutugimo.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/bozevovuwi.pdfIn PDF document text
    • https://mfdesign.hu/files/file/nanudotatubugebo.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/fisekuvogebivema.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/egjn2mfkrr0jqk38bj0ispe7so/25817232463.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d704c1f857c98d5b5262b71923031a07/23214042292.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/542ff866b9930fab382817b23f7a037a/rezux.pdfIn PDF document text
    • http://llux.vn/uploads/files/gujizexalenotadabifo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc4cba7a3d---repilekokep.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/zujazi.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_off00010432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C44 17296 bytes
SHA-256: d3350dff6f6f12acc9a19dfe4c1e18c681ef869548b7cd9dfc0f99838c254b2f
font_02_sfnt_off00014979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14979 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8