Malicious PDF — malware analysis report

Static analysis result for SHA-256 8170e63fdd4f18d8…

MALICIOUS

PDF

78.7 KB Created: 2021-09-12 09:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a63512da40332956f7694c044344a404 SHA-1: 4f08bf3bdd20cca708adb08e9d2a9bf612695031 SHA-256: 8170e63fdd4f18d882b24dd09d6ef5abb948adcc844f1c5ebda3ea9b1bab00cf
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm indicates an attempt to lead the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.truck-transport.com/ckfinder/userfiles/files/bilimetikitavitupadurixes.pdf In PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/29793797392.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/zovaxu.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/7550628677.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/lotaxixozeza.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/76577203654.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6d51af35f5d66c4567d7134c97a64f4a/mubegujiridolu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3f25d843---paserume.pdfIn PDF document text
    • https://yuktogel.com/contents/files/58794682363.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/batabalonekozafegob.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/79591836768.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/46577258506.pdfIn PDF document text
    • http://parilka.by/var/upload/file/8124043437.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/44692369418.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/41237726579.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0c1d55523---21611649470.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dfaca89f7---pepobebatunibedej.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/22419652423.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/58781045411.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/12627256350.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/71293280735.pdfIn PDF document text
    • http://hidramaco.com/files/files/jadavowapa.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-6/20210906110209691653.pdfIn PDF document text
    • https://ferropula.hr/files/10311781453.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/badavidak.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/45525374284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=g+nettrack+pro+apk+free+downloadPDF 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_off0000cee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F7 17584 bytes
SHA-256: 13bbd4554a61a7169d0ac42e36969967300b47ba6b9904758caf26b088936c93
font_02_sfnt_off000114bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BD 10572 bytes
SHA-256: 7374da5fb332d5a5d19ef1ae851894785b58bd90e2418a43e92fa5b07c973745

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