Malicious PDF — malware analysis report

Static analysis result for SHA-256 9277e3ff18993864…

MALICIOUS

PDF

76.4 KB Created: 2021-09-25 08:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be2407b8fbf907552873b780a3909c86 SHA-1: 78a18add7016cb17f27d977138805e877dbf9be5 SHA-256: 9277e3ff18993864f35fa409ed51b2a29c03782ee00ce67f295ecc1f2d117bfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates the document is structured to host or redirect to malicious content. Although no scripts were explicitly extracted, the nature of the URLs and the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=teleprompter+pro+android PDF link annotation
    • http://brlairport.com/images/file/fimebigukakajago.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/bunonumuwosasozen.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6e827043f---xijexufilixaj.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614111b812379---sajinabukediwuzopakukidi.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109140643506594.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/85344224853.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/wolin.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/lqdtqfke292nf8vnk72f9c1od0/90096427221.pdfIn PDF document text
    • http://forestheightsgarden.com/ckupload/files/2181739748.pdfIn PDF document text
    • http://deforma.it/userfiles/files/98005225894.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/tivivadanizazoguje.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/58298291517.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/kefusegurepejunarurop.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/93090040679.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/81603332338.pdfIn PDF document text
    • https://atl-50.com/files/file/tezogukupuwipowomovibin.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/nezesok.pdfIn PDF document text
    • http://isitekmuhendislik.com/userfiles/file/79938118902.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/553670c2ab466eceb98174dfd571c09b/getuf.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/pekosoj.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/43034276458.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/romoxatulubumijiw.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/zogij.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_off0000c126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93D 10348 bytes
SHA-256: 255ba2abddd53a83c6f66fcb5f8cd7223c44bc8dbd2bf69a0588fde8ebf0ceb2
font_02_sfnt_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 19772 bytes
SHA-256: f840e7bf372d73b6f3a0327bb5590687e10b6bfc8bc4a3de1d780f228656a3a1

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