Malicious PDF — malware analysis report

Static analysis result for SHA-256 647ae790974f6ed8…

MALICIOUS

PDF

70.7 KB Created: 2021-10-03 00:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4db5926e7b0e07d31c75cd4d6e87b099 SHA-1: 92b95ac2a024079dc6332130dc18d5b3dd66d8d1 SHA-256: 647ae790974f6ed8d71bc9f18f35de7e9168e33e3b1d5ff23d82fdf2755040c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://garglob.ru/uplcv?utm_term=list+of+filipino+architects+and+their+works+pdf PDF link annotation
    • http://didula.com/img/file/91829246782.pdfIn PDF document text
    • http://manhtreminhduc.com/webroot/img/files/62623985182.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/39517831334.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/tagem.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7e1e12c5d---zamazovavigakowipex.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/lakiduza.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/fijuve.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/88744707856.pdfIn PDF document text
    • https://chilepools.com/contents/files/wilise.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/tegiropa.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/79424857127.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/doxugof.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/vodomirolenudegopiguninos.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/lu28c8dd3qpekvkua6leet1c5t/bugabewalafite.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/jalonalo.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f4d5d27c8---17784351016.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/6007362295.pdfIn PDF document text
    • https://ekransamara.ru/files/toradu.pdfIn PDF document text
    • http://446888.top/userfiles/file/didimulasetagumurakugilav.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/limudex.pdfIn PDF document text
    • https://greenways.at/userfiles/file/wiletenabaj.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/xofiziwo.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/84442805105.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16143041fadd86---duwomijulinerodired.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/sowomirajasowoduwukofe.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109130254086810.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/69758380930.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/24595893224.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_off0000b5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF3 14816 bytes
SHA-256: bc0acd5f31f04671b4eb8cc6f817e79e32f79e1939a9dcd43b47390bccea16de
font_02_sfnt_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 10852 bytes
SHA-256: 46a25dfc983c5f85ef5735bb5c0b5b13ca12561dd8dbb3ca2b17449c13978ddb

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