Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5319cc8b6b88fb…

MALICIOUS

PDF

72.8 KB Created: 2021-09-12 04:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 771cf5aa8b31efd2aaa15e06b9d71937 SHA-1: 4c7a5b8282fe8781e07d037591372d5fd51cceab SHA-256: 4b5319cc8b6b88fb76bd635ccf3d2867f6afd174a85010a77a9276f4303c0dcc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=vidmate+downloading+hd PDF link annotation
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/vunedetilivofatokopiweda.pdfIn PDF document text
    • https://ms1oke.com/contents/files/govavapofuvavejofumubugu.pdfIn PDF document text
    • http://beijingteye.com/upload/files/sidubufebiker.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/wivijawizixugaba.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/gatureborabujirudaga.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135ff757f588---61602635755.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210909_6022AE871C44A350.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/55982298008.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1f068c577---nenigexaluvetowoduluzeja.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/dugubiziwunaz.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/50474784800.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/18340409294.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/fumodowadirek.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e7119b08a5a6840f28cdf263116c6f3d/fokevujemunotolenejowi.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/13639313458.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/wizupabudelusavepeje.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/96573724821.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/xirenupexoni.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/39630443876.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/79089883379.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/zobedebozek.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/nuvapimovurexaxukegita.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c83f01c076198831292ab5098ddfb939/39266891073.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/bepuba.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_off0000bd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 16140 bytes
SHA-256: 4e14a276ccd446cc76341bcf6a24b2d0c0f8e1303cb61df5190b21a85f0afd5c
font_02_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 10480 bytes
SHA-256: 3d251d89d5e30bb69e14bd09ddba80d2e48b969355950c90ea8ad01ebd6936a1

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