Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada4eca94e854cfa…

MALICIOUS

PDF

75.2 KB Created: 2021-09-08 08:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 59f2c5b623001313967540a6bb043ab7 SHA-1: 9f69f819d7754104ff75857bbbe3fb5a094c93d2 SHA-256: ada4eca94e854cfa7f35308a5522d56cf654cce954d228ee0584a72b628986da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16128642e76320---jajudilamuj.pdf In PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a8c83e6269f82c2b2eab9e2a293be229/muvuj.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/xidadivor.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/98592709045.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/e08t6k6l30nii1dmgretfnvja7/79592533732.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/90775264356.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/50141394890.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/99570406758.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/bososo.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/85166458769.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jewuvuroxikosikaneso.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/25845234368.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/17239d2e36d88b4f11479be56d8064c5/69258019435.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d8b1357129806556885bf7b286057513/worimivaguwotepoz.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fe86c9213---94195863576.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/naduniwuze.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a060c4fdb656efd1c6cff88645302e6/pumipiramujugule.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/juxusadozukabozejamemo.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/warov.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/7b6ec92ce592bf4f398009047c148bf2/zotebivuwasivowesir.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/57759515482.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/260138265816.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/90553962029.pdfIn PDF document text
    • http://adveotec.com/img/file/xiwolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=convertir+un+pdf+en+word+editable+gratisPDF link annotation
    • https://mediaget.com/userfiles/files/78627773599.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_off0000c134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC134 11096 bytes
SHA-256: 304bb53d0f601e46dbf142ccb6894d98cf01acb5a2ab3f342f442bb596f9fc87
font_01_sfnt_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 17012 bytes
SHA-256: 7519c87b6a40d3f958af5fe31eeb15d9ad7428ee328d602472f43ea75d60ba55