Malicious PDF — malware analysis report

Static analysis result for SHA-256 3956c50efc8f4e03…

MALICIOUS

PDF

67.5 KB Created: 2021-09-12 13:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb6f181e155a8ffe30363454f1125acc SHA-1: bb4a5917ebfb62d5550c67d1ef599beaeb0fbc6e SHA-256: 3956c50efc8f4e030d5c852ecfcae16387583cca01db5ccfa407d291313a3aee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, identified as a link farm, pointing to various domains, some of which are hosted on compromised CMS uploads. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further indicates malicious intent. While no scripts were directly extracted, the structure and heuristics suggest the document is designed to lead users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6872

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 https://brukspec.pl/upload/file/pixozolejuzuwipisatido.pdf In PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/25421589259.pdfIn PDF document text
    • http://pk.mo/userfiles/file/76382818321.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/temaso.pdfIn PDF document text
    • https://comfort8889.com/upload/files/bafapogevuvagamipeliv.pdfIn PDF document text
    • https://brs.jo/userfiles/files/rokikewoxajijowusiwi.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/nivefigojixilorubir.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/sofovujemad.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/xuxowedadisixalasugezoxi.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/liposekelukorazefiruj.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/jujonupisuvukuxopuxaza.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613d575f64d07.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/71682319155.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/7750a52f755d65a6b8c8410b5ead1fff/wizuwetuvigosanajuvijip.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109060451197748.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109010708256201.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/39879783950.pdfIn PDF document text
    • https://artbynela.com/uploads/file/61698380975.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/nupekemazefasudo.pdfIn PDF document text
    • https://wonkingchina.com/d/files/22746883461.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161318e890fc36---3022973835.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/19400508864.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/s78ou01u0b2tiq9cvq2am1bgpm/vamedakeraberufakofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=gta+5+online+download+mobilePDF 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_off0000c077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC077 10540 bytes
SHA-256: aedae20e97143b664926a78fcea44dab953d0166af7a0d4eae9437290ebd0045
font_01_sfnt_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 16236 bytes
SHA-256: b701ca6ed0326e6ddd8772dff5a3552b172fcbcf6c8e39f0c013ca13d19cfede

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