Malicious PDF — malware analysis report

Static analysis result for SHA-256 914a6b05a80943e5…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 14:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1bfc503802109e2086be9e66b52711e3 SHA-1: 87c919bbb62d9c848e3eccf2c701c48e4ea63ed1 SHA-256: 914a6b05a80943e5b28c4fdb99508647f70d1986653d52e499494433711d2ded
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple links to external websites, some of which are hosted on compromised CMS upload directories, suggesting a phishing or scam lure. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ruh-center.ru/userfiles/file/78953024304.pdf In PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210916_900CC6C33D12AD3D.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/tajovevogunobitupumu.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/r25cavvb7lrg2neei000sdcgh2/mixosamepuzovor.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/96122060655.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/64741095230.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/kinofukinigek.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614e63f621005---95992012266.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/bd67e8ecbcd2cd0318a75f068c68f09c/xamenot.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090500280373499.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/febalaxejumanamabilaji.pdfIn PDF document text
    • http://autovoda.ru/upload/files/mumamipa.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/setoni.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210912222256_mgueot.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/83419089463.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/poruzeju.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/dunebulogiwitimutikiwe.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109161222548404.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/molivuzod.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/42205224694.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/42314325073.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161365e323ea02---67800267251.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/fuzejevezokatej.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/vugojibezawereg.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/64245755613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=redmi+k30+5g+purplePDF 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_off0000b215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA27 17340 bytes
SHA-256: 0c43c6544cb9a8c5eab6c8436e5805d259c5d57a8ea7401c1f743e2de06e7bf4
font_02_sfnt_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 10748 bytes
SHA-256: 3f026c710bbbf4b06bc70ff50362146359dede545ca36873bf03c637fe1d753c

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