Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4b23813ecfe904…

MALICIOUS

PDF

71.2 KB Created: 2021-10-01 00:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dfc8bf982f06474b078923a482c93848 SHA-1: 3707d67024e5c37f38d436f0d43e1b8e751b830f SHA-256: dc4b23813ecfe9045ba079cdde3ed8abd5e0f113577a2a5b3f3c5758622f4425
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan payload. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/wapefaxinudugisedenobete.pdf In PDF document text
    • http://jcon-aps.dk/userfiles/file/90829854314.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/jetive.pdfIn PDF document text
    • http://dgkno.cn/upload/rogukovabosokaw.pdfIn PDF document text
    • http://tradotel-riviera.com/file/newisilikojijol.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/3178084519.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/75792791691.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161432e8a7f0a6---kuwenagefowiluxasilopafev.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/ridakabubadaxe.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/guposove.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/46378905657.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141385d10ade---9421126650.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/lasidufaveja.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/mutumuwasukabupewonixiko.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/kogijovapino.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/gudofozotizejosoxedijerov.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/wofafedeforuja.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/gakesebedekororitogevewe.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/bufugikosabisugowanu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615592de333ca---78214337654.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcbfab814---visaganulevomubu.pdfIn PDF document text
    • https://majubesar.info/contents/files/zesabugiwebafoxenogezu.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/87634550211.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614778cfe2fbd---47208866495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+windows+7+software+downloadPDF 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_off0000b55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55E 16108 bytes
SHA-256: ece87f7fa96747b7ac1cd5db514869acc119d5a3e5fa8ce0b4394c1b2b2ef195
font_01_sfnt_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 10464 bytes
SHA-256: c6b84a6ee844e83b31ee98921c0a00bd4654323768380dbacbaed4e0e97ac699
font_02_sfnt_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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