Malicious PDF — malware analysis report

Static analysis result for SHA-256 24de2ff1fb94c7f1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 20:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 126b87f45f6b4926f1ec81a802c068eb SHA-1: 34030cb1ac94a04a807af5e82954856b55bd8b5e SHA-256: 24de2ff1fb94c7f13829152db42d99bf98e44ffd06f0e0205c95955a392d5d10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external links and the nature of the hosting services used are indicative of a phishing campaign or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.sun-green.eu/ckfinder/userfiles/files/35725013939.pdf In PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c7d36fb14---wazulagowaso.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/28786818151.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/tabisesuxomawevologoz.pdfIn PDF document text
    • https://mollis.rs/files/xejusafovu.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f0733d7ef---bukib.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/waparu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af7007fc4a---bowivedukidatakuvunumiva.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/judisakopadanazitud.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/podix.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/56013988965.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/35627465163.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140c0eaec31a---6301970920.pdfIn PDF document text
    • https://dootion.com/data/attachment/file/1482773979.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/zemotivozom.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/febesedoperupu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614026cf9fd23---52829914583.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/pajosexiwubiwelutanakes.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/46804535943.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/63591877165.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/8854924798.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/81574248429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=minecraft+mcpe+1.16+downloadPDF link annotation
    • 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_off0000d5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 16764 bytes
SHA-256: fda5029d28fa3cf355bcd76c77b75a859028e6f90753841800faa51e7b79558f
font_01_sfnt_off0001013d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013D 10980 bytes
SHA-256: bec20bb55883dedd4afb333f1d551e36a2c467ce34f5f7ed101d674f085fc08c
font_02_sfnt_off00011ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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