Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff4e0377b3cbac4…

MALICIOUS

PDF

71.9 KB Created: 2021-08-28 06:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d9aeee5867b2c95ab62d10ac0031c5a SHA-1: bae9e298980da0676e5a7439e82ff0e09f3f75c4 SHA-256: aff4e0377b3cbac417ace9e5f547efbeb6aa43ca3c6de649ad9e88e88179a945
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a malicious document used for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=non+infective+endocarditis PDF link annotation
    • http://pappteam.hu/userfiles/file/96668202127.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/28635090097.pdfIn PDF document text
    • http://arsvet.ru/img/upload/13054299882.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/sekij.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210515162529.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ddiaag3d7nijrn26dfp06gld67/gutezifulosel.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/xosutiretobijevud.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/92933274060.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/kesojemev.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/3b96ad9dfcd960303955d4f2b6a2acd9/lorofibinikovap.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/utfiajlqk9qo2391id1sutc4ga/sebelojefewivuzurunaluk.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cbae6179d0---durogufuz.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/15359748468.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/pemumesa.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/89931301787.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/68843179471.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/8876367160.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/63976514047.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608696730ddcd---minesezifusanukuw.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/gapimegisexofasikozezir.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/faneradokijivumi.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/74505267045.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c46da214d7---tixubiz.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_off0000bbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEC 10464 bytes
SHA-256: a7d8daffa926d02968d414437c60b629ca997c385c5e61869d2950c19133c5c3
font_01_sfnt_off0000d3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D9 15148 bytes
SHA-256: 9b2b57bc4685a91356c129cc5e2b4917bd86a48cd47a4a7b700353092dd35926
font_02_sfnt_off0000fa3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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