Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3505fd4d15dab7…

MALICIOUS

PDF

87.6 KB Created: 2021-08-13 09:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3f5bdd5ae51cf2a8cd7e9a8b77c0366a SHA-1: 63256143d6e283c087b51aa97c73b534847e814f SHA-256: 6f3505fd4d15dab7ef104a096b8e0adb6bf90b29399304278266f02c00863208
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. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, likely intended to redirect users to phishing pages. The PDF itself does not contain readable content, but the heuristics indicate a phishing lure and potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/uplcv?utm_term=bizerba+weighing+scale+manual PDF link annotation
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/054o8ih14t00om6fkime5mipoa/sekaxajefed.pdfIn PDF document text
    • https://ksboutlet.com/file/files/31052635048.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f8d254ff6---boviwogidaref.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/222be86e65bedd1774cef4f8f0b2fbb1/zumotijutukififeped.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608b21099eccb---87135685364.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/2df615939e6c30e94e9e7206c4db8b14/53265996306.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/de44e3aade5b247cc93082f014ee8a72/talopexegaminafezuva.pdfIn PDF document text
    • http://abpaluso.com/upload/file/43112890150.pdfIn PDF document text
    • http://lagrupacio.cat/file/98672812091.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/82033293974.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/loxewuj.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609082bfd3d73---wuwetinoxagesizowobuz.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/13c1fdca45106ff8da7c62241be8410e/27810738136.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161125fac7906e---vasalob.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d89730caa---55693528081.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985d9c66fa1---pibusebagupusep.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/32467934022.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/nizuranemupuluzuv.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608255e5923eb---fuxejutogune.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/a8d0ec6e677e30fdd426bf4349cbf4c9/movixofos.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///riligisuwodel.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16115f53067200---fifogatisof.pdfIn PDF document text
    • http://atomleasing.ru/media/File/tozunopanotopidofimisoduk.pdfIn PDF document text
    • http://fxmeat.com/upload/file/b3ef35d03f6c687559a51387fe9e3923.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_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 17244 bytes
SHA-256: 3eba4d22a228e9ede231a29c201d8de313b9faeea548dc6978570f34bea92fa1
font_01_sfnt_off00011fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC4 10900 bytes
SHA-256: 910bd679f2732170f2e12a3e1c8064060dc80718db62a505a70c18a9d64ba982
font_02_sfnt_off000138e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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