Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d06a359249d5478…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 15:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7815b81c91cd3f440b492e5b490f8483 SHA-1: 62c3916cfaa2d235fe5e5b3bcbff643664689c35 SHA-256: 4d06a359249d5478b6790d03a84737bc11b56a576085f5e30e68652ae8cafce3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. Heuristics indicate a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or second-stage payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://la-klamm.org/Files/files/rikozumuzovuroso.pdf In PDF document text
    • http://levne-pohary.cz/UserFiles/File/16302250629.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/538929f7c70b35b288ccf05bea2b6e2f/piregelumotoxopa.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/300de8359433e91bf7a3ecacd04e2a22/28638855782.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a0462e97de121a7711d33c37fd34991f/76330638884.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/lemesimaloza.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/wikilenadiwusifazoromo.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/wenoguderuxatuwefuvapavow.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/gorofevotumawekusozuzedo.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/46976688385.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/paripiwusavipajebowugo.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/woziwiwar.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/lixufifira.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jp0r860nj8er8hd9ge4fgrlp70/zajikef.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/gebemo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5bb6af2a1---jojabomudusutuzozolo.pdfIn PDF document text
    • http://senn60reunion.com/clients/876260/File/xabegitelezoxafokuregago.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/balavatakisebonixelew.pdfIn PDF document text
    • https://kurtwohndesign.ch/userfiles/files/virutelaseduwovepifabu.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/9274273686.pdfIn PDF document text
    • https://nilsagame.com/calisma2/files/uploads/dalofoluzij.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/fotalo.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210714033019.pdfIn PDF document text
    • https://iword.de/userfiles/file/gitazatovexapopeximivara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=protocolo+actg+076+pdfPDF 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_off0000d578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 10640 bytes
SHA-256: 15674577d93573e1d508bb380af089816d4ac0e7eff4229d8dc692e17c5c9b69
font_01_sfnt_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 18232 bytes
SHA-256: 6cd298aedd301f481c3bd984e1d4f37a1a3c59af43952badbc87dd94a821b133
font_02_sfnt_off00011d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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