Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98058661fa0cb40…

MALICIOUS

PDF

74.1 KB Created: 2021-09-22 13:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 92dc32804e16e2fad67167bc4974ca4d SHA-1: 9a7d7acea52bb3c65b9a3cdebe86a0dbb470f630 SHA-256: b98058661fa0cb4078f44877687d7b05dadc5819516744042ee74826e44432b8
154 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress upload directories and disposable hosting sites, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure point towards exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7062

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 http://hiroi-es.info/yamituki-n/uploads/files/30555544110.pdf In PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/o6nkjcha5cf0ig48fnc9ao8p4h/wunizowajobonivomamojevo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142781b1d9c4---xodabujowogunesatijo.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/88543149072.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/magaxawibojazorapanixevam.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/juxofupakojisaja.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1530c0218---pukono.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1b85e3e38---lijevarafoxagimimokadat.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/tavuvebedataget.pdfIn PDF document text
    • https://qud27rxl1-k61l.com/contents/files/zufew.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/rijuvuwujo.pdfIn PDF document text
    • http://qdjshg.com/files/file/gubixegozimamomewo.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/fanibemipa.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/86850628552.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/goxutukik.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/19911675794.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/foxefilatojatonarosoreteg.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/zijesutukejijaxi.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/mutufosujowubepesexim.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/japikixanetamaxuzon.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/41375553363.pdfIn PDF document text
    • http://rurisnet.org/images/file/folurefijokaworusaji.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/zedorilisibilexezib.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/rovupisegalemipod.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/79362538216.pdfIn PDF document text
    • http://esejsc.com/upload/files/56489588310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ninja+rush+game+downloadPDF 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_off0000e5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F9 18112 bytes
SHA-256: 501101a237f3d5467d581f1ea0e7d7204ce59c6689dc2742778ae0ce55a04af0
font_01_sfnt_off00011464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11464 10892 bytes
SHA-256: 4aa0bb7eb412e5ea0af596e77a139a257b8bc59fd7d0c8652b869e8512a5c252