Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e7dafcdbdba398…

MALICIOUS

PDF

76.1 KB Created: 2021-09-20 04:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 364332f9d8012a73ed688a259f43e287 SHA-1: 965d41657d4c745cc2925d0a81b28b66f402b8c2 SHA-256: 25e7dafcdbdba39860403046d78bc3c016974c6856b5e1ea37828bff0f8898c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=how+to+find+internet+password+on+phone PDF link annotation
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382605921ad---degebaborewopiwuvut.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/rerujilunokipopezeg.pdfIn PDF document text
    • http://telektrans.hu/editor_up/dufov.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109020925104220.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/69430488759.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/37739401810.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/76591933200.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/82598141221.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/wisasisevonotafowokadi.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/jadusuzu.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/zajugav.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/fobej.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/vajajuxagulowomo.pdfIn PDF document text
    • https://projetovm.com/uploads/files/jajujaropavozexoveseja.pdfIn PDF document text
    • https://tomas-music.com/contents/files/65973444975.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/gutug.pdfIn PDF document text
    • http://ellev.fr/upload/files/zerumu.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9394b9034---sapojijonexafuxixef.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tetudiditoliwida.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/67261777666.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/jezulu.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/tamoresolanekawo.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/27535504468.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6ab60e4e0507c46fffdc0488892d4dca/kapusapetiput.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/f65n9p8f1qkukrcg56d40nr405/14374159439.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_off0000c62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62D 17004 bytes
SHA-256: ea703d8136a523084da963f5e514f315879fec740366b1138b1a6051b9a7135f
font_01_sfnt_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 10628 bytes
SHA-256: 3325b52984a9da84a1782f65d2c065204ed01fbd3cb3be530c7170fb6da19f0a
font_02_sfnt_off00010a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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