Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e2b5c1e45f0d00a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 10:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d72c4ff58b173f2c148d2fcb045a3472 SHA-1: d68f1aa95a5bb219fd9d5a85ead0d1ef20f5fb2b SHA-256: 2e2b5c1e45f0d00a2f58bd11e3f8e65c0cd952aae4b8148ed29c60d496e11e72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and exhibits characteristics of a PDF link farm, with numerous URLs pointing to potentially compromised WordPress upload directories. The document body is unreadable, but the heuristics indicate a pattern of directing users to external sites, likely for phishing or malicious content delivery. No scripts were extracted, but the presence of external links and the 'link farm' heuristic suggest an attempt to redirect users.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2548

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://bugskin.org/userfiles/file/95495716496.pdf In PDF document text
    • http://ledins.lv/cms/file/60041719501.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/sirod.pdfIn PDF document text
    • http://asid.rw/userfiles/file/kudaginev.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/54910604668.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/pawubuxepozerulepo.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/44469140175.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/xevijotovamen.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/77214839184.pdfIn PDF document text
    • http://annabarons.com/files/files/36229671116.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c240eee64d---mokonamigow.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c76654233---61332469718.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/15016313705.pdfIn PDF document text
    • https://taperagi.com/contents/files/13722890793.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/72805846192.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142357aaa862---8240815610.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416e61b8e66---pozotefumafufujowitowiv.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/64471727639.pdfIn PDF document text
    • http://pk.mo/userfiles/file/rugozawulidofifolikadejo.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/kikexuxibodoforosi.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/bijomumerubuziwejora.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/58118478872.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3674200076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+stop+spam+messages+on+androidPDF link annotation
    • 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_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 18740 bytes
SHA-256: 809fa832288f83f6698d78d6c212a34c9b2996973fe52b7550a3c738d3ff69ee
font_02_sfnt_off000126c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C8 10768 bytes
SHA-256: 85adfe730ffcd7d0c39c704050d2a4f5df79c9afd720cf8c14decbfac96dbc44