Malicious PDF — malware analysis report

Static analysis result for SHA-256 936208f509c719e1…

MALICIOUS

PDF

78.3 KB Created: 2021-09-15 21:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d4935bd646644aeebf39217610605e8a SHA-1: af1ed071e0a6d63755834bab49308c16a1c4734a SHA-256: 936208f509c719e185be61ece722356a32f443babadd79941cf6811c4b1e4dc1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristics indicate the PDF acts as a link farm, directing users to multiple disposable domains, some of which are hosted on compromised WordPress sites. This suggests an attempt to obscure the ultimate destination and evade detection, likely leading to a phishing page or a second-stage malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://xn--b8qxb801j.tw/upload/files/legexikimogurakukul.pdf In PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/pupumogamugabebosifij.pdfIn PDF document text
    • http://hkalc.com/userfiles/88095775001.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/navafaxuwep.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/nawazuputikewemodebinu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f32df39525---sibot.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/32917957433.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/padegaxuwuweba.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jamebemozoxemadixesamunud.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/zowapetof.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/25d334d95f9711c4b5057d5e5d1f0023/33199756326.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/sasadotisaz.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/fazeba.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/21184751117.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/39373933318.pdfIn PDF document text
    • https://sadex.pl/fck/file/74041837424.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/54625517249.pdfIn PDF document text
    • http://labsshop.com/d/files/31200099470.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/bewuxiv.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/tepanaxekorekafovozima.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/80777658770.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d62a44beb---7815391083.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210903155826_aof4gc.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/mapupuxegor.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/89107938376.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/visedenulafobamon.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/34470982946.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/12225587568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=recovery+after+factory+reset+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE432 18028 bytes
SHA-256: eb1ce8c4988409ef62c879877ea9e717f6a1a4748809ff9ef2fa56613e87c68f
font_02_sfnt_off000112ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AE 10648 bytes
SHA-256: db2f0776884daa85860d1014ffbd5363cc2fb862167c2401dd37ca5088bb6428

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