Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12fdc3d97afb78d…

MALICIOUS

PDF

79.0 KB Created: 2021-09-07 14:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c6c74b85f2683591e7befee37d9c57e0 SHA-1: baf9fb6663a6e49f1e577616c697f1ef6b02dcb0 SHA-256: b12fdc3d97afb78d65c6c9dfd825a6bccd538be056d43b6a2795f8bebc22098f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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=headway+elementary+student%27s+book+pdf+download PDF link annotation
    • http://pkynfe.net/userfiles/file/tasemirexiporobufogebosup.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/28124361332.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/nbeptn65nnhnfaip81cor5ohj5/xamutavuzagoxogiwedub.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/wepijatafeb.pdfIn PDF document text
    • http://vinmexindia.com/uploads/67575344175.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/83334712076.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/1232573723.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/a5e0374ebd14130e52d5ce02cfd8ebd3/42194953937.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/493f082d637246a11c73f5b0f7309f0e/36097635730.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa35957f3b---87577592614.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/gazepazojewavoga.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4b157533a---59756768190.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/0a6fa12c62fede3c317384d0c43a697f/farawemonumivuxoge.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b3d47fc76---koluz.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/53qk7i5uftg3sq6gp29ksdlik7/80979686548.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/gexolefogilopesixowe.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8a5cbfee4---nomirek.pdfIn PDF document text
    • http://hangquangauto.com/files/20091348529.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/4137g7q9cenop6mpoottvp2lt2/kobugezenapikozagakepak.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/1396512287.pdfIn PDF document text
    • http://mtntoproyalshihtzus.com/clients/4/42/42f4769cb4f2467af64fea76c5682520/File/wilavewubunelopiwarad.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/22335112971.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c97f7da9b28---falibidubajur.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59E 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_01_sfnt_off0000cb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3F 19972 bytes
SHA-256: 88baf8a2ddd1eab4dee7a7ab617ab9f32ba188498de31c8fd2b65d3b5a4daec6
font_02_sfnt_off0000fbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF6 11124 bytes
SHA-256: 26926ab0c36a00408c00ea7315d14b0c4892325c2163c830cba29429bf87725d
font_03_sfnt_off000115c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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