Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e1688ce9b329aa…

MALICIOUS

PDF

85.7 KB Created: 2021-09-02 02:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cae63b962579b10e15f8faecc0ec035b SHA-1: 6361ef3b4be55d7c432f558b4457c9ae4821c07e SHA-256: 24e1688ce9b329aa2beb302f95343d8bde7ba5877276f5e91554b881bdb93c1f
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The presence of these links suggests the PDF is intended to facilitate phishing attacks or distribute further malware by directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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
  • 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://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7f91e6eac4a59749cdff6ad030f5a8d3/sagup.pdf In PDF document text
    • https://lescourailleurs.com/upload/editor/file/33896072911.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/vuputomagiro.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/43477332040.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210521173342.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/740c72673bf6441958be5690ffae1df8/2128602747.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160784a32cd652---22338701331.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/nonininikimikelijupovobo.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2717a2013b---27734782456.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/narapapuz.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06a73850b---guzubak.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a527d89fa4e---kejag.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160817de58e757---xezog.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097e7f8e4900---12814063917.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/bgcuqnauphmm3rakm1o65oomm9/limotorete.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/84239591573.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/dugugu.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/48b9e85a452a10f21923631aa723cd0f/paribasobudoxefa.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/xizibugona.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/071937a1bef83c2518a2bb92b54d35e7/vabufufipumok.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/36134784922.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/55657193465.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607438f2f4165---mikoduzugixegelusigofamis.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/roxozigujotixefugatum.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/73958c5aba623c8476f9e4c21608ce0b/fufok.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/jhg55oq06n90lpdfcupe6p07a5/88626737215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=resigning+from+work+while+on+sick+leavePDF 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_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 10972 bytes
SHA-256: 3d66e094194915239dc5e4de24f410440bdfa391adef66dab772f27e6f82f9e4
font_01_sfnt_off000101c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 17940 bytes
SHA-256: fd372955219c7a491e9bbfd695ee8f2e8580c4cbcc59add139f88cd21803920a
font_02_sfnt_off00012f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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