Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b99ecfe487f3d4…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 16:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf7876b856d429ca2e94e8cb1e13f24d SHA-1: 54710d7aba4648f98c58e6ba29b58307adaffef5 SHA-256: e8b99ecfe487f3d422fbc395154ad1e622b585e46d3c2ebb2eb10769a7a0f4b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous external links, many of which point to compromised WordPress upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=comptine+d%27un+autre+ete+piano+pdf PDF link annotation
    • http://mmprogetti.it/userfiles/files/rofopabodufofosu.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/f3cc646b8838a95b6a5720d6c38b3d09/82164218352.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/xotofunasokepemaxi.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/vfli3cfou2if8qle19snamhgen/negaxisumikamalup.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/ligukapowox.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ssfe5hqorufau4grcreuaanf24/35770107738.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/b0693dd0b56a3ee32e70873876b09489/segunevigojezavuj.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffc57c8c270---vejomefisurad.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160940b4f8b93e---pofololu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1611ee51656d0b---busotobuz.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/watujibawuxos.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607bce8f80571---64225984116.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/77606204796.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/10432512894.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/difipek.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608448c42a0ff---boxenad.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/5064075125.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/pefoxekofimixexerufo.pdfIn PDF document text
    • https://afayl.com/userfiles/file/74491327297.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/34894522689.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607954bab2976---jitelo.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210806192618.pdfIn PDF document text
    • http://airfa.it/userfiles/file/9077633449.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608662ff8effd---pelabeva.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_off0000daa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 10612 bytes
SHA-256: 0182186856e49fce6efe2d6afc10cdd2ac78afcf114f117782b399a830094b3c
font_02_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 20216 bytes
SHA-256: f7272f93b0961e4d24a1adaf723ca685dd97a238cec08c4ec1ffa3c5e32f143c

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