Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d26dd8706a3f646…

MALICIOUS

PDF

55.6 KB Created: 2021-10-02 16:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 91d3c1b89598717bc44f0238c666a5be SHA-1: 0c3f5ca77aaba02983cc6bb5aec7bc015bf9a3d9 SHA-256: 3d26dd8706a3f64621f9db1f880b35afc1783a338ffb917921d24608afdd0a0f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8472

Heuristics 5

  • 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
  • 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://hanart21.com/files/userfiles/file/52494435442.pdf In PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/44622758628.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/80388054448.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/gepukatelikiguk.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f55bd73db1---zubofofumotenibemas.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/68994802251.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/85811481689.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/lamabaj.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/morelevafoxizosetava.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/busotojonadopirajud.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/2937501495.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/novuren.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/9043839563.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342d5a00d98---2772136117.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/ripezobago.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161531355a87d2---88887325471.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/tejewiwogulazavix.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/2553038901.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/pitoguweb.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/34116513712.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/7305405364.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/65542561554.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ea82707fc---69342778184.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161569704cfe69---maxazedukodoteguzufefad.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/jirezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=who+does+the+t+mobile+commercialsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24B 10664 bytes
SHA-256: dc1a400d7fb6c5361e8ce92dc3494921676803e359a5ea148cd23ff783867213
font_01_sfnt_off0000cabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1