Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8ace39ebf738bd…

MALICIOUS

PDF

70.6 KB Created: 2021-10-06 23:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 97f13c3dbcefa605a75046d2d83f6316 SHA-1: 61a9db80826ce6201d365d0f82f5bf4ee920ef40 SHA-256: 0b8ace39ebf738bdc6e0d0b49d01a5a2884ef4a8006bac30216199f296f27a1a
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and link farms indicates a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=but+how+do+it+know+pdf+free+download PDF link annotation
    • http://aspbae.org/userfiles/file/roxanorokatubulekexomokop.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/vosapirexegubadewinulibit.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133177bc7f03---59612703060.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/zotinukile.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/26905912597.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/52762193456.pdfIn PDF document text
    • http://cabini.it/userfiles/files/80300491030.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/97408925205.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/fesavebofaxulojorolitu.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/fiwibax.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/60733749058.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/9191910920.pdfIn PDF document text
    • http://belniig.by/public/file/68185656058.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/vinutesi.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/totolowi.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/vuseresuxovutor.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/lusukalemokobozabolavo.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/21242733849.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/zazusawe.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/dehgfocagen3m6l9f0daiegrek/gamolenelixav.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161401bf879c0b---98778613048.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/wumazuge.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615d878464a66---boxez.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/91933321945.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_off0000b4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A7 10760 bytes
SHA-256: 4c0891496e467ee891f64ef51cea5b07ac79dbe764c9d26bc01ef8aea4aa5dbb
font_01_sfnt_off0000cd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57F 15292 bytes
SHA-256: 9a02cec58b62dae467286e8513f96e9d7d18998a57c7d2ad9299c6f5da52fb0f

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