Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5d283b3703ca56…

MALICIOUS

PDF

88.2 KB Created: 2021-07-04 15:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6fa3faacca58d1d71d3300be01d3d80 SHA-1: ca6a444d78e0fd29d285202eb8a793f07e17d5b5 SHA-256: 5b5d283b3703ca563329f26a8844d27ea9b6b48a38d6fe77f9dcd4cbc26665d7
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links to external sites, many hosted on compromised WordPress uploads, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=icici+prudential+mutual+fund+common+application+form+pdf
    • https://rumusjitu.com/contents//files/wavibu.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/62c8087765cd53c537f8e087dfe9caef/64140084450.pdf
    • http://agarimo.com/archivos/archivos/61977655188.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0cb2729c388e7cdffc5f7951d44575ae/famipakosesupoti.pdf
    • https://basalyemek.com/ckfinder/userfiles/files/ribexesawedilobizut.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/237d76cfa9c8fdea3a825d5ef5f74900/61473326811.pdf
    • https://oxi-dental.ro/imagini_ws/lasurakizadugekikaronun.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b17563d4a---54991363763.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787d761e573---15391094810.pdf
    • http://maihome.hu/admin1/file/dujabigisisopididepone.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/srnscjrqghnis1r896oj9r627f/solunetularakajovijesuxo.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca841d8c10---61630197447.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b43342cd03---91879941362.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/b002481b6d4c7cbf4dbc8a73ad728c51/gojidorajigojazerewarokog.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/abd5b9d0edff8fdb1421698096644307/31743071712.pdf
    • https://nbcmedia.vn/ckfinder/userfiles/files/49393698797.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/rigigewawofemusopisebu.pdf
    • https://cncostruzioni.com/userfiles/file/nafexenefuwulok.pdf
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/taxilozekivoxeribunivavag.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed12183294---sojuluzoganevisikuvexe.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/tfdguu9klk42vgovqaj798jfk5/nusapobirijenefi.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b450fbdf31---74095771559.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/bj05vgmlu30pevlg5acqdg8r72/99567836838.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 16792 bytes
font_01_sfnt_off000109e3.bin
54b9ab217ddefcfa4f30bc5233fcdbf524214353d91f86becf4c7869447efdc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 18052 bytes
font_02_sfnt_off000138be.bin
ccde29036c6322e980b793ca6c6b45b00150deea9dee1bce0aaa29efcab848f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138BE 10664 bytes

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