Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cebe5a3e750000e…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 18:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c78260c8615e9c0259392b03f3c8ed6a SHA-1: 4cc885001d472f46f7517762cbe7e1fc2a5b9996 SHA-256: 4cebe5a3e750000e04b7b12fe80a218429726b6cb85c80c08163dd1078f289d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to websites hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm on potentially compromised infrastructure supports the classification as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=double+commander+download PDF link annotation
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/755e875c0c1b0aa240b0a71f627242ed/520882405.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/kevuxopesaz.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/vipikonebevumifulugusuka.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/73905397928.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/94060126975.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/puzakezalasox.pdfIn PDF document text
    • https://e-room.co/userfiles/file/fokuloni.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/pusezesu.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/pexuwa.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/tuxaridagevotufurapibez.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/5426580814.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/30957363136.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614951d1945c8---17902118904.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec73c079a---pibavo.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/47776373285.pdfIn PDF document text
    • http://pk.mo/userfiles/file/bexipiwoxop.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210913105247.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/96652612403.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613787260e11b---lezimudanunadexotuzewow.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/12698128322.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/71550718576.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/tidonovimegesobadagasenug.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/xulidedubamaf.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/97038583690.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/35176205805.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_off0000b0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F1 15560 bytes
SHA-256: 810d5018a6cb7a291ed362ef37c23188e34ce969650c64b295efeaf405688b4a
font_01_sfnt_off0000d876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 10500 bytes
SHA-256: 0af34ce3c1746724541cb32888ea7ad59406b4cf4448bca3712d42b4b2ab969a