Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6c11d97c6c5e23…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 09:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c20bf3c15e44fdc4da4cc6301800e2fb SHA-1: 654fc885b6bd38d8146edc73a2d7a5c28629c6e6 SHA-256: 4f6c11d97c6c5e2394bb075e0a1704cc37e7b0677722c27528efafa9541189f0
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and numerous URLs, many pointing to compromised WordPress sites acting as link farms. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing malicious software or extensions. The embedded JavaScript likely facilitates the execution of this lure, potentially downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cructi.ru/uplcv?utm_term=useragent+for+android PDF link annotation
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6e38883ef---65681906196.pdfIn PDF document text
    • https://tekmaker.com/upload/files/fegavuxewesoxavir.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aafc47bb3f---nimefegepop.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614160e442db6---24342967433.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/pulapajuruwegagigepuw.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/32007168879.pdfIn PDF document text
    • http://fitviewer.de/files/file/13925390267.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/56293465020ceb6094d5ca0143bd798f/xevebexiduwe.pdfIn PDF document text
    • http://popmetre.com/news/files/gizogamigi.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210911114753124.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/65967761216.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417acbdbbdd---vuwufosubob.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/jixujepaz.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/jonewogufa.pdfIn PDF document text
    • http://skia22.ru/pic/file/domanuzilofuzugav.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-4/20210904224625601342.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417d35620f1---34369868204.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/xaxuzur.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/8b4a10e6575d923d72873165a51e5256/gukegitivojibugekizavo.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/roxetutuga.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/53035198478.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/xujagu.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/bipuxelabi.pdfIn PDF document text
    • 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_off0000da01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 17732 bytes
SHA-256: 2a67b20b794926b4d58fb9b222f81546443794457d4e090f28075bb53b521152
font_01_sfnt_off00010865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001207c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207C 10492 bytes
SHA-256: 0cb8e2d6fcb187d6cf2e009eaca94e34f3b91e0279376096f567133af9177823

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