Malicious PDF — malware analysis report

Static analysis result for SHA-256 63337c2b25baa22b…

MALICIOUS

PDF

70.7 KB Created: 2021-09-06 16:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e669d274d6ea91fca14ec3ec72bb1e61 SHA-1: ca0034c9beb6ea4bbc88b160d7718e49e4cb974e SHA-256: 63337c2b25baa22bd807534534698551bb0fc3b3fa47ca53c32ead349049b86b
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress sites and disposable hosting, likely for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2573

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://orderpoet.com/ckfinder/userfiles/files/rarupojixedepakikat.pdf In PDF document text
    • https://newtech-utm.pl/userfiles/file/22950082393.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210902122407_487hl6.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c2d36918c---49078946357.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/417250437.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/03f1dda874a13b20d920898b22ffdff6/88986620023.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/b4fde82b6a48477f9c359465a507dae4/megutazuv.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/39920771931.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/53705570688.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/jafojogej.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/46239222189.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/gexizuve.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20ca9818e1---pibemipe.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/9046465027.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/74510983278.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/cf4378dc1fce71105913da990e12bf5c/mixavapifarakamawemeduwap.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ca1180b290ceb3d8a2a0dc5a50ec23b9/movebekugusejiniwufaduku.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/7881365250.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/wilajinifasaterew.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/v6ajf3plmts6aojp7slanpaldv/morasugovabijijil.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021082109411920.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210904165049.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/kogifovijasagujikituzem.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/vugolure.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa8ba9f958---ferenelikewanijekebosez.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/kasakibadubizemeneret.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=oral+b+extra+soft+manual+toothbrushPDF 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_off0000ce6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE682 10752 bytes
SHA-256: b9aa06d68f933b2dcbe2e8feb526cf51ac87eb314f8523e2d6fc31bbcb3221b9