Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8e293709636da7…

MALICIOUS

PDF

86.3 KB Created: 2021-09-21 03:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8bd4e94cbccecaeb13aa7f628fa59222 SHA-1: ac0e7962654c9fc4f58550c57b54ad15d09a1de0 SHA-256: cd8e293709636da7238ed1da3c05089304b6f3544d2b2339ea5c3acec5f08238
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://synerhu.ru/uplcv?utm_term=android+launcher+for+seniors PDF link annotation
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613933396fe88---mekopumozefikakamotuw.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/28656036270.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/lexanusone.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/13950228778.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109132018205762.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/13574081837.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/36594738844.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/10846353966.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/77461342375.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c1db9407215255ebf71ed5417c63b167/voxetatadukogepim.pdfIn PDF document text
    • http://precisao.net/files/files/50353680890.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/dofedujapoposavolixo.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/solokaw.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/64902648073.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210920171833.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/vufekuropubajapije.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139b87bd205e---60808737963.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/68506553951.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/44027264624.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210916022835804.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/57603749752.pdfIn PDF document text
    • https://matricula.arendic.cl/files/26720820350.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/36252216711.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_off0000eff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 10556 bytes
SHA-256: bd9f39e07dae0a921e820f8bbbff28120632e7674977da54fd25f5f7122bc8b5
font_01_sfnt_off000107ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EC 16908 bytes
SHA-256: c0f9fa7f4d449c4e52dcb15db4bf7aa42713c02dc9be84d867a7b4db6ba76347
font_02_sfnt_off000133fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1