Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbaf4f934451ea46…

MALICIOUS

PDF

86.9 KB Created: 2021-10-08 15:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8c6a34ccca4ec765e2a7dd8894bd7e3d SHA-1: e0ce67c16162005b0757c718798afe9e65a69ede SHA-256: dbaf4f934451ea4695d6fc661ee940a70c25daf8582215bb99f291304d7f354e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=monique+wittig+one+is+not+born+a+woman PDF link annotation
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615c872c87242---33692379261.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b7be42b7d6---16573345694.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b992023d0---nisefomonalo.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/xowiz.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/42146636028.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///pavabugubopaso.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/kodisenipixonukizibu.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/rigapabafupirudifos.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/31680093177.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/91401601865.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/57338721327.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/vigotuvokefunojadane.pdfIn PDF document text
    • https://profesa.net/userFilesfile/puruxogusevidodi.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/22345673938.pdfIn PDF document text
    • https://clubon.top/uploads/files/72869944308.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/26607386406.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/6145075861.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/verumopejosexew.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210909124313_s08m52.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecad4088fd---lefotebaninidobule.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/87299096457.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/jatuxefej.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/13945503826.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_off0000e974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 10868 bytes
SHA-256: c61add215b69cb909f0de29758ed3b3bcabfed7ba60e2703b0f4718ed3b9312f
font_01_sfnt_off0001025b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 19924 bytes
SHA-256: 328f32abe875b9acc3a69d99654f2cc882fbba39e199390b964eab84151076e4
font_02_sfnt_off000135dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1