Malicious PDF — malware analysis report

Static analysis result for SHA-256 429e6e51ba2e9414…

MALICIOUS

PDF

88.7 KB Created: 2021-08-26 02:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a32790bb07a319fe31cf3db78576119 SHA-1: ebbfbb2de32fed6e319a2cec68bff9679d298f53 SHA-256: 429e6e51ba2e94146d4eafa2a009c0b31584d003ef4118ac5fce102d24315f52
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files, many hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://crewmak.ru/uplcv?utm_term=emirates+red+crescent+fitr+zakat PDF link annotation
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/t7a41tlk92f1u0ud6fb7g1q9m0/pututiko.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/detipefisifudojuroxazugi.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16124dede47e19---57938904213.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161127a3f38a9d---79608565975.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/5keqmutpj09tcc1crarb3l85d6/giwakef.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b2baa81c8---99382973639.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qaipn290qc1vtle8phljjmtuc4/60712805911.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/melido.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/doporuxejotupofalipibu.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/tolezurola.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210823072513.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160905ae0403e5---keduwa.pdfIn PDF document text
    • http://mweb.cz/images/file/25791285065.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/f00a01795c3789c5aa53378f6fce4580/82050737682.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/34539262959.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/32646804160.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/95872387432.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/lonejirema.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/t3322aoml6mjuqum568qckuh87/14110098498.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/tamuzerukag.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e645d53da---46860313656.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/66416403695.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off000100c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x100C2 20360 bytes
SHA-256: d0c035fba27940e1b32d464f250142fd282e826241b00de360faf1537a720652
font_00_sfnt_off0000d072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD072 10608 bytes
SHA-256: 82ba94a1f25b36d4cfde0143d73207a166d0e4ce13f0735d24b85c0b6375e89a
font_01_sfnt_off0000e8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12381 17692 bytes
SHA-256: 352d79e99b03e8da46129ccc495efbcf5cfdc64a244982d6f9d258de0c90ec2a

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