Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0eba839e97739b…

MALICIOUS

PDF

69.4 KB Created: 2021-10-01 01:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 54caf6511161b45d94726e1b7befeacb SHA-1: 52f190ccef576f22ddb2143abdd36427d0480f4e SHA-256: 8b0eba839e97739bbae1c25750fdd9b40cc03bb122535c24acc5fa719266cc8f
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URIs that point to other PDF files hosted on various websites, some of which appear to be compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to external PDFs suggests a link farm designed to obscure the ultimate destination or to host a collection of malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.sonorisation-auxerre.fr/ckfinder/userfiles/files/22511027896.pdf In PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/21957318039.pdfPDF link annotation
    • https://grandhotelushba.com/userfiles/file/10456154565.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16152175ac9909---80866957775.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/43190005753.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/338255900.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/25368548570.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/lakegovuxubosuwaziwali.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/vogulokokezuwozotanutat.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/75817745620.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/filuxebukipanatiwageko.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/47128106369.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/luropajodefuvavowot.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/56950278446.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/repapodapo.pdfIn PDF document text
    • https://maturana.cl/upload/file/lezogobesudezefiw.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/pesejaxedujowu.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/57383895134.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161485fd67f5e7---werivumaxivexab.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/1f2a7f1a841509e80a86ac6e32386477/bipofoxuxalexevawo.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/61554954178.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/72621776083.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/fegusumopinusabigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=throne+of+glass+series+epubPDF 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_off0000b193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB193 14988 bytes
SHA-256: 6b4d11267c53f68102456e04a169e39618f1ccaada763caec15dbfb9dd1ea598
font_01_sfnt_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 10740 bytes
SHA-256: 3f56f25eb3e41440cf88413f33a1140cd73c276ee5384b86433583b0b75039af
font_02_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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