Malicious PDF — malware analysis report

Static analysis result for SHA-256 1236cba75c66a092…

MALICIOUS

PDF

70.9 KB Created: 2021-09-16 19:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e708bb6c1b7c67cb6b3c2bfe2fb8883 SHA-1: 3d1e9347673293cc3a817e6ce355cddad8a373cd SHA-256: 1236cba75c66a092d4f8fe0bea9594a2dc3041ff7088a32ff835f9d8d7274b66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://drafthe.ru/uplcv?utm_term=hd+mp4+mobile+movies PDF link annotation
    • http://www.corazondelsol.es/ckfinder/userfiles/files/mirogugufed.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/gatefasurimet.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/45718837626.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/pelilenilatozutorofuv.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/natetusuvorit.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d410d5f150---puwinemojenatugonubawepu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613875db78cb0---21634647457.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/tidikomegugukiko.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/zimajovobotegidatenu.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/kurutekoxid.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/tasilojogamulipajaguve.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/bizukawikizajutukixe.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/91164984303.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/tizoxapowapasipadapeter.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d57a605848---finigivetugaruzozimen.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133489eac833---mitesajawujafimebelajafo.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-11/20210911142725806474.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210903090508.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/33809685756.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/9383901509.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/25036968307.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/46203528984.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_off0000b3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D0 10364 bytes
SHA-256: 26aad52432af02df7170a8e31d079e689f39c6a6ec3620fca8d5989b867f6c4a
font_01_sfnt_off0000caf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 17176 bytes
SHA-256: d473620d79cb13aa1423384d9db89a38d15932003feb5a505188f22915fb1cbc

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