Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c30a193dbd6a82…

MALICIOUS

PDF

102.1 KB Created: 2021-06-27 23:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 02ac49f012fd7c7a950a76cd0d5ad748 SHA-1: 44b82a437dceadc3dc8bf3dfde2cb33b70bc4d25 SHA-256: 44c30a193dbd6a825222047593fb347f14ae8bc61b2388a1277f7ac04efa2ba6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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=chi+square+statistic+table PDF link annotation
    • https://addsfly.com/userfiles/file/1140229429.pdfIn PDF document text
    • https://coluer.ir/documents/file/94962815455.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/37243012423.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f319d4eed---lujadasafinogepot.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/74954514559.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/lufexiwavowuwobon.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160822cf713793---16567931759.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cfde0eaaacf---96972151643.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c1edd072e---magetafol.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/85187442358.pdfIn PDF document text
    • http://ipublicity.cz/data/file/7864633333.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/15494270048.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/67fcbe1033f95fbc5b63a4a8fb3d5dbb/gijorani.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/35874332384.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/junaworivosex.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/pipizuboropejixi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c0eadab57---50386400636.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/96943217039.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/bvs9v1sem44a6mmq4g9q3e5okb/niririwu.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/0jocu3njgrpnr46e2tfs612386/leriwegono.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/7b792e2abeaab7f41fb4de8dedf8ecf3/64960242505.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/135c0c55f4e572e4542b4ac3116fb7ee/xubamerupofegozetoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ddd7371cb---situwudumuvupo.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/qdb04640e3u1nb24es59bdotm4/jemuzenigogudonexele.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/280066855e4b338868a89038d6181be4/27520527310.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa713fdfaec---matolunugolumoviwizub.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0980554abb---nuzusazukowudij.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_off00012c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14458 17776 bytes
SHA-256: 06845a0df62829801cbb88e208a4e229e630d9c6d293f1e60e944a3ca658fd34
font_02_sfnt_off000172ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172AC 10520 bytes
SHA-256: 40bf79f6cd4b48236ed277066d1666ee6b90e1f72cc96b7fe9acbd3ed0baa8c9