Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb8c88b6f10a4e5…

MALICIOUS

PDF

93.5 KB Created: 2021-08-27 06:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d41ad29426cd72f4754dd941854ac43 SHA-1: b8e6f83977c26e59ce4741e808dcb42bc20d9790 SHA-256: acb8c88b6f10a4e59fb3c43e36cee54c5ec0a9e6719efd42287a704187df785f
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, and exhibits characteristics of a link farm pointing to compromised CMS uploads. Multiple heuristics indicate the PDF is designed to direct users to external, potentially malicious websites, with one URL confirmed as benign but others unknown. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/6691b2bb504428cf154aeb5f21f7f5ef/woxedoxitale.pdf In PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/24307844687.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/tolagezij.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/nomozibekazewegolur.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/wenabidiwaridububujiv.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/5361193032.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/76034406406.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe7f73d0c9---92495167228.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7246690272---lekavamefa.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/21517302757.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0bd1c769b---80193895711.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/19137051568.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/92813328943.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/wodipegajenujajedoboxenur.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb54e0f11c---71269189476.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/25262396605.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc606f35474---82059588473.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/9383554584.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6c56ae9fa9a0eeb10eafff59124d92e6/rigizulunanulolodolupu.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/87468632061.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/89a16856b51678f1e1cd2a4698cabc61/taxesumaletiposotepim.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a11f174c5---woxumoponoxasus.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/u9bpdvitlprh5ioa0i3f8v17i6/25359952483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=treatment+for+loss+of+smelling+sensePDF 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_off00010798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10798 10520 bytes
SHA-256: fb25480cdbc2eb0090c826eb423cbcb92968253860b6d77d755f04c6060fa76c
font_01_sfnt_off00011f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F84 18688 bytes
SHA-256: c7418cc224ad1c8d19c250a8e881e796f29a99b4a9226a3d87798b2c4d519a3b
font_02_sfnt_off00014fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1