Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54c96bb85430b59…

MALICIOUS

PDF

77.2 KB Created: 2021-09-09 09:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cef37d42ce5f3c4b550cda7802fb0295 SHA-1: 9877d6a2394fff82b0baa8ca8b6a61f78e3bc54d SHA-256: e54c96bb85430b591bbfd89c8ebef72282cf5976bf3d72c80cdae31de22b4889
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded JavaScript indicates potential for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3a310d86c5a3ed0ec25d4cda697c9ccb/rokudapo.pdf In PDF document text
    • http://apnschool.in/singhania/downloads/file/fajabavojogojatejaz.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613134c6e5611---5020010216.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zafedupalanativukupufitu.pdfIn PDF document text
    • http://househouse.it/userfiles/files/83223808344.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/94360552378.pdfIn PDF document text
    • http://artediapharma.com/upload/files/giwatoxoruxen.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/gumabasivebaw.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/50601972391.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/27264383254.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/jojabalezubif.pdfIn PDF document text
    • http://www.polni.si/Images/files/95919044176.pdfIn PDF document text
    • http://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/42102184021.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210903032817.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/37493732094.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/mefamijotezika.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd3022d357---5269713176.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/30627521105.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/jasabexegoxuvasega.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/81665421805.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/peguvo.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/kabifuwofuvuroratepokatu.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/wenejad.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/lavajetexesupapero.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/mageladen.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/29494192343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=my+recorder+pro+apkPDF 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_off0000c88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88D 10200 bytes
SHA-256: 0caed8341755098995d54d71dfbc4232f6f017a6c21fb88e1727b5df235d8665
font_01_sfnt_off0000df8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8A 18360 bytes
SHA-256: 2b294103574c4debadb32251d7e2062c3a84d0be5411207e3430425841a78616
font_02_sfnt_off00010f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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