Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e8d88512eeab70…

MALICIOUS

PDF

71.0 KB Created: 2021-09-05 20:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c1befe07483bde144d9a8350d66597fc SHA-1: ca06084f9465273d54a156ea50fa290a17c816f8 SHA-256: 91e8d88512eeab701d4f6566c8612615046902a7e43b05dc2736d25dca985fd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple links to compromised CMS upload directories further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://prokoncept.hu/admin/blogfck/image/file/64547145543.pdf In PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/74265953972.pdfIn PDF document text
    • https://samtee.com/admin/images/file/73638613043.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/44292356668.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/61947520266.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160be6e35d3e59---9698419728.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/nesopopatesegujiguvozi.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611413d3948bf---16757184046.pdfIn PDF document text
    • http://fitviewer.de/files/file/39484383659.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/sokagazevubakubogogelam.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096f45e05ddf---jofevejerodivekade.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/57950135965.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021071613590681.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c72f5e16a56---wipureledusubokuten.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086907b07b15---60255959924.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/73035a4093382566d06ca028471a1115/tekozuden.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/jigotenetijedike.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/zegawujuxanarazuzakomika.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608faeeece55b---rimapuxorifokigebes.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/nibukexinawokir.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5524_20210713045032.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f9c43f95982589f6fce8cdffd5854ce8/viriditu.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/pemenurilokotujaxa.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c9be56cf912cc71135bba81a2626d5fb/17436206230.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/72382588914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=french+er+verb+conjugation+pdfPDF 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_off0000b6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E1 15132 bytes
SHA-256: 013c94fb13c5c3a7b5d1b201729aeff92a154a7f58ace59d6c0cd768d97538f5
font_01_sfnt_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 11100 bytes
SHA-256: fce2a2add4d9fa4057c1d0a1fdb8cc9342b71740497c11e1d54a29984a54ff4a
font_02_sfnt_off0000f652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.