Malicious PDF — malware analysis report

Static analysis result for SHA-256 6365bc4f21197bd3…

MALICIOUS

PDF

78.1 KB Created: 2021-09-08 15:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a734bb74ce8b7a524954508d58a9fa25 SHA-1: 41f610e4d307fa9e1c933c2e5f2df90841ad04ed SHA-256: 6365bc4f21197bd3294e09d8f60c3987fc29c98c696f7161b078e0cf618ea13e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and other disposable hosting sites. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4634

Heuristics 5

  • 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
  • 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://coretry.ru/uplcv?utm_term=falsos+cognados+ingles+espa%C3%B1ol+pdf PDF link annotation
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/webilavarari.pdfIn PDF document text
    • http://mutitar.com/user_img/files/39684022434.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/zavumejoxolano.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/52369702392.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/rugikiwevatolozajig.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/47358925169.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/geduvabofejalogoj.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/285166260.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374cd369154---26635872292.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/19631812875.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/xiwabaxogajumimox.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/kurupowisijuk.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/58713552311.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/mezeresi.pdfIn PDF document text
    • http://scro.ru/pic/file/49367169185.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161302048b9661---rolagenodikijizenizemo.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/kuxajulitebowanimumumimek.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/rawenebevewiwodudelokede.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wudibo.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/92317202321.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/sedulor.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b481b88f2---mumafuwelobod.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109021104253734.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134e95729b48---tojanadovuzi.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/55813343366.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342195ab80d---42767612704.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/b83fb403d53247ce137b7001c6112d62/merakiluwimesadejetezaw.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CF 20168 bytes
SHA-256: c4bfe6927d819f030f55ec15431d6af36eecb7eacc536f5c706e114b9b54b1b6

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