Malicious PDF — malware analysis report

Static analysis result for SHA-256 048b51fe5ace479a…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 02:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 56dabf9c698b431872fc371565421c64 SHA-1: d7d64fe2e4d6378266e0a26d12c8d599f4b922b8 SHA-256: 048b51fe5ace479aa844458773a0ebc7d32bd2e6e88a44d28d260dd1c6a5fd5b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary attack pattern involves luring users to these external sites, likely for phishing or to serve a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6994

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://solener.info/ckfinder/userfiles/files/63092528468.pdf In PDF document text
    • http://hurtmar.pl/Upload/file/2743514741.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/47328943672.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/wutufi.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/76372893888.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/taditepafuguxogagoba.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/mezovixiwe.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613627f188471---70399342203.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614165a83ced3---jorage.pdfIn PDF document text
    • http://kisito.com/userfiles/file/xawumeboxujosabivunuvinel.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f2a0740a0---tapani.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/lipowo.pdfIn PDF document text
    • http://protok.pro/upload/files/jisenarumon.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/q8sa3gltsckf5vpc94f45fbaj0/vibadadakozufigoves.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/xizaletiteximuxuwugip.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/52031245469.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/noviwitewetijemakafuloxi.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/gaboreba.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/13826795690.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/97042275616.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/55758365496.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/jelolebezajutanupusoxom.pdfIn PDF document text
    • http://schubert-hh.de/image/file/46757027833.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a309365df2ffc02f0dd8e963823688e9/tisezufisofirow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=download+nova+on+firestickPDF 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_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 18956 bytes
SHA-256: d12b38bc645ccbdb73ec207c5a8125ac61ec72134a38f81cc47822d9f0d99ff8
font_01_sfnt_off00010d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1