Malicious PDF — malware analysis report

Static analysis result for SHA-256 4323060faf4a09fc…

MALICIOUS

PDF

72.2 KB Created: 2021-10-03 02:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7606df05ed7561e9c69eac18845139ef SHA-1: 13574944432dcb25da286a4d2592010bcb90a4ab SHA-256: 4323060faf4a09fcfc5321477ddfdbc4f420f5b6e5d3bda75251f5059f81e779
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document is part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection further confirm its malicious nature.

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://chcial.ru/uplcv?utm_term=discord+bot+spam+message PDF link annotation
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614e650eba0f5---tolixepabav.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/zedixonesurobe.pdfIn PDF document text
    • http://masonhn.com/d/files/97677439278.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/3223164593.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/defudokutusijuworewu.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/13128429596.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/c48271e0868ac3cc1b89f9fcb5f97033/32532931410.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/japoviweropoza.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/rukakibipezofefowogadoxib.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/suxonap.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/visukavajazut.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/39811159562.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/48569810872.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e62754b43c204fc3d93780b945343be3/54175956913.pdfIn PDF document text
    • http://sql110.com/pic/40143181229.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/97529823868.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/golenizeforamigefazasos.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/jebubi.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613dac7277b03---12276918332.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/sutofiwivep.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/fowew.pdfIn PDF document text
    • http://citra.cl/userfiles/file/jixegirarojam.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/27420854886.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/63960717244.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/sitofedilejazanapi.pdfIn PDF document text
    • 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_off0000b713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB713 17108 bytes
SHA-256: 4528d2e15604dab96ecf1bc14a9968900db0870b8a3fda19194e0d3fc9f80474
font_01_sfnt_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 10848 bytes
SHA-256: 880f0a8adf3fdc12b3884228748e5278784a086c265dbab8bd7194eb947e4676

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