Malicious PDF — malware analysis report

Static analysis result for SHA-256 d307363499ac9238…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 05:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c964893adabcae230638a0daa2afadf8 SHA-1: 14c3df68d58083e4c9f46daf0f6aa2728284e503 SHA-256: d307363499ac923881b06d17de6056df0d6a3d85dcd15b5e5c37e372d4090a92
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Heuristics indicate it functions as a link farm, with many URLs pointing to disposable hosting or compromised CMS upload directories, suggesting an attempt to redirect users to malicious sites or download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 https://filetorme.com/upload/files/kavokarevemajejosiketi.pdf In PDF document text
    • http://ltmetal.com/userfiles/files/pelitozepabam.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16135ff776b9dd---jibotuxa.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/wibuwilulokimijupepuji.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210923032357.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/60810234697.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/73728307696.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/futelupogolinupuv.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/gexalaludijapo.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/87739481209.pdfIn PDF document text
    • https://cargobull.cz/res/file/65629589036.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/nonogupinu.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a6727ba9ddca00902c4d809f83bf6466/11404621092.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/74942542481.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614e58c9e4af5---99984089647.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/tezof.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/kowaz.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/limedojemeturagozurizi.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/rapibevabapitesafixiso.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/87768751353.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/gidotoze.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/putokituda.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161391064dde0c---49448492753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=offline+mission+games+for+android+free+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_off0000afc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC9 17056 bytes
SHA-256: 15e9409a80a936e530f8edb2f6702534406e4f747d37b4f781c763d429c79eb7
font_01_sfnt_off0000db6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 10712 bytes
SHA-256: 6b8a21d12b8ec19ceff1072ea1a1cfdab9952371993772c62c43f4104e74d271
font_02_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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