Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da0b80b45574afe…

MALICIOUS

PDF

62.3 KB Created: 2021-09-15 22:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ee441d0e7ecd7b04fb0ea69eeaf3283 SHA-1: 89dd76ec72f8b2a250ed112503fa993359396283 SHA-256: 4da0b80b45574afe35715ce4bb7c0d7231beeb0e52e9aca486184454ca77fee9
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are likely part of a link farm strategy, potentially for SEO manipulation or to distribute malicious payloads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9100

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.
  • 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://oniceh.ru/uplcv?utm_term=app+to+monitor+router+traffic PDF link annotation
    • http://studiosiciliani.eu/userfiles/files/21057395362.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62300156885.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/kefuzodesowub.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/54106616189.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/xirukoxakovuwozeg.pdfIn PDF document text
    • http://adriennemason.com/assets/files/sowimibamatonokevoporarox.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/35544222346.pdfIn PDF document text
    • http://silver1979.com/upload/file/baxixor.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/sexafosiju.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/5c88c62ab1971112a5a58f2ff6be5910/75138236453.pdfIn PDF document text
    • http://archbot.pl/files/file/91763838652.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/20059778106.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16136822dc76e6---9207536598.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091523105877328.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/depusaregajefilejirusena.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161339f5bdf567---xuriso.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/17957461420.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/vufasaxeje.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/regod.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bffd4a5d9a---sokuwexaw.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/lavazobosubuwiner.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/60655171781.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/demidawize.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/17415177119.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_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 10508 bytes
SHA-256: 543aae9d68de914b92c1141724f2605395dfd61d884d21cd31a1b01ad1a6185b

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