Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a71520ff0e68d5…

MALICIOUS

PDF

83.0 KB Created: 2021-08-11 23:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: debdab49e3a3d283b328022e40ffbac0 SHA-1: c6bc6c9c067fa545cfd33e2c231807e80cedafb4 SHA-256: 23a71520ff0e68d52bf464e7c86b8d3826b5a87a370778df34dae5cdfd69b91d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content and redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/3a26fbc091efe314a2464cbc1991b450/wumoved.pdf In PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/mopujavimafilijopatuxakum.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113a2cb08721---35039372950.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/j0npnr3h38danrisomfdim6m3f/86831005475.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd1b34708---23762310737.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/rudoxisetipuxinarese.pdfIn PDF document text
    • https://vestol.bg/files/file/xorifepaduforabupolewugiw.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098a6f14b260---girukekon.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/df9734a765b3fa36706e89513624b2bd/kulawitaxakomasa.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/15smqaf1b18bif4kvse38i13bh/26332176781.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/68044042962.pdfIn PDF document text
    • http://land89.com/ckupload/files/44219975862.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb467bae3---zizulosu.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/41042341413.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/ramawupipozol.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/bepofakozikibetovonaw.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbb83c16a27---23939596457.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609426570df57---lumetemipaxezadale.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/05aa9c84b1e962ae0d6ab4ee02b231d2/bijinifatovuzobifib.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/zejedenuwavafimujevinoget.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/69329307047.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/7d2s4lo06btivj5as30kaiumqc/60149636249.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/169fd930797aa3f7d8965a2999af1c6d/xulesunifozixewujifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mortadelo+y+filem%C3%B3n+pdf+colecci%C3%B3n+completaPDF link annotation
    • 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_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 19156 bytes
SHA-256: de7a48a805159f95f0a6fb2f23e02decd6dd1b9de31d5be7ec17bc8d4f0f0f85
font_01_sfnt_off00010b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2B 10860 bytes
SHA-256: f456d584a14aa0d5284f54f9967c5525efdac301d66a2dee82b5fdb14bfdcf32
font_02_sfnt_off000123fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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