Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fed0eb427a339f…

MALICIOUS

PDF

85.6 KB Created: 2021-09-21 09:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5adb4b469381341ae923f8349d14a03f SHA-1: ad694800a38c7946512663c9442a144fceac473d SHA-256: b3fed0eb427a339f1161b9f125c9e602f5ba95e113f370cc2f87b4ff97c4fde8
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://ms1oke.com/contents/files/13659777164.pdf In PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/jowiwojezavaxobanorozuwe.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/40087912476.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/xodunubojafiwis.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/7284201441.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/gazigelorekanekab.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e9010f92---wavinelujulatiwujowate.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/mugalu.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/sodotidiweva.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476243e70f3---lurazeruxalomoboga.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/vemigoroxumo.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614030ee29417---12684030317.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/82762078022.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/zidab.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef0d7ed889---35487587163.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/nakamodulu.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/pepupeze.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/merekuwodijewaguvisiw.pdfIn PDF document text
    • http://fructusartis.com/i/File/pupaxuvuvebuxarekuxojeto.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/90004669303.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/89197362264.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/pasegonisoranuf.pdfIn PDF document text
    • http://trieuduong.com/images/Download/kivasugizedesugonulatupiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=best+browser+games+no+flashPDF 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_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001038d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 10848 bytes
SHA-256: 8aaf1c52c781603d30074585b041996f83b4d97c87f3b44c945616a389cb80be
font_02_sfnt_off00011c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C85 17164 bytes
SHA-256: afecabca96b6cddb959aea00f7dc269310a895f94dd1a9b8798e15c786c7d7bd

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