Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7983a0f5419aa5…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 09:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 08bcae186ff9e3600ee9a23f007cc67d SHA-1: 0aa371612b0ccc30a9eafff68e718824707446f8 SHA-256: bb7983a0f5419aa526463b971df7e0f0dbf1e9ed27ad3dba4543b2311b163830
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=do+not+say+bad+words+bible+verse PDF link annotation
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608251251072f---bomuzoginowikewamidid.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/28798353370.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/33537796731.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e04a55de0---mopajokopobodibulagu.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/pakos.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/parolagubaz.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/salidumepal.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6cc287a8c537e75a65d2f23f0b6821f5/96747555504.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/takop.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077ff05ebfee---77001797568.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/nedofu.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5bd5f74aa4---26620326222.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/xeladofo.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/e4703b071a3d776519c2a468f1e38154/bukeresejopoderigixefis.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/witolifotarewowumen.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6542d55e6257f144af8bfc68473ada1a/norejiwotewuminosezu.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5daa82b63---xunevegejawudagaket.pdfIn PDF document text
    • https://egf.tw/test2/images/file/wateguf.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610b9324e863d---livuw.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f94229d65f---53743607855.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/175c3ed2ac2222ce324dfa5e37443179/jilisam.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb431dae459---67652237459.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/bemonomezalufarasorabij.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_off0000dd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 17800 bytes
SHA-256: 720a832426b41cc48daef2a54ccd56bd807a9c439de0a1f88114ee2d0528f55f
font_01_sfnt_off00010b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B62 10648 bytes
SHA-256: e6316b086d82fae291425b394f2afa2a9dcaf1cfad9aaff80c1ff186ce6db832
font_02_sfnt_off000123fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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