Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0cdbbaa88e3f80…

MALICIOUS

PDF

85.2 KB Created: 2021-06-30 12:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f448f4994f2f76924fcb3baa904773f SHA-1: 8e1e257ad17e213a6e8cb980899e10a102eb67d1 SHA-256: eb0cdbbaa88e3f801a934104667dd0550e07ad2e4c1fc430a33d837a0d0767e1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many hosted on compromised WordPress installations. The presence of a PDF_RANDOM_URL_LINK heuristic and ClamAV detection indicates malicious intent, likely to redirect users to phishing pages or download further malware. The file's structure and link farm suggest it is part of a campaign to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=visual+basic+6.0+practical+questions+answers PDF link annotation
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b728ca2a5c5---pijokixusoweku.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92951a3b6c---10445638951.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/sarefigajipoxugiz.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a725e632---lubadazabuxixudonided.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077a12a5ce39---88712589612.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096631c515f5---58210943433.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/josedorusavaxatumareninij.pdfIn PDF document text
    • http://yuha.be/_files/file/kesexugizudupafires.pdfIn PDF document text
    • http://candientushinko.com/images/file/92171097018.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/khfqqccti7uljc1s7u8t97q706/88558590849.pdfIn PDF document text
    • http://01host.ru/userfiles/files/biwifon.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc6bd20dd6---82197139481.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/4483bd643111066ae841f8d7567e3e4b/mapivarugigazerulopito.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/kedubuvedezenejubok.pdfIn PDF document text
    • https://avenue102.com/uploads/file/nebijixikefudinirudonow.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/80071713079.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/nabenof.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3385508a13---20028336611.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/vegolazifetabisikeg.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1ae8651a27ac39091b8583f6a6f364bb/22827506735.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160737d8924686---pameluwiliwuwubita.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e577a86ef---41919431271.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/gatudulabuvuwasol.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/janamotamutejalibujodo.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160917706aed80---69832259549.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/fanopelokor.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607930548034a---rexepibisuwabakuniteven.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_off0000e86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 11164 bytes
SHA-256: 13f3e5ec85c910f5d8b9da4dc8b20ad29c236201301b11f63862052350afe32a
font_02_sfnt_off00011a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8C 17072 bytes
SHA-256: bffdacc2f99a9fdb75d3620e411d7cdb8273b69aa1dd5df0a3b7a8dac85508f6

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