Malicious PDF — malware analysis report

Static analysis result for SHA-256 551ee71b615b9b89…

MALICIOUS

PDF

89.6 KB Created: 2021-08-01 02:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 356d2b4da7fa5157548347ca2400b96e SHA-1: f851c41f650752053f1368d917b2c35d4b127036 SHA-256: 551ee71b615b9b897c1480009e40080b51e6dadf8349aee3839b9479850f8f7f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be facilitating phishing attacks or distributing further malware through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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=i+love+you+baby+frank+sinatra+movie PDF link annotation
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/b634236aeefa61624b7069fd09137ff4/fiverefuzuwofepolobi.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/bovevukoxomebixuloxu.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/1ff48a305599a6c94b95eac98e619705/soxurozigevana.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/nitixizofebogiwaxef.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/mohr0j9i5r3eg08m0m38mcn6fh/60588057571.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/luzifodelogijezuvazog.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/rizutajavuken.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/4111311248.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/pisuzupilimiz.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a48684815b8---21502933796.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/mosexetanofojen.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c852c53303---pivafijabi.pdfIn PDF document text
    • http://vodnik48.ru/content/file/jiwelabujuxikeboto.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee87b052346---gijiwekowisakiz.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f065cf2c8c---muludev.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/4115e69ef584dacf83e68453e74cb795/waxeributuxizamupa.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7bded0166f5ef54e1b2ff050b198f8f5/gojidubesimesurode.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/42355fa46486bff64eaa44c6140a2171/58903355801.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/pugofali.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/8c848628fd955e595bffefa3c3453513/zuvexobe.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/jofowepukek.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/64448907310.pdfIn PDF document text
    • https://mauspro.net/upload/files/22364796582.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_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 10836 bytes
SHA-256: 08e4b97cfed53dcf76d12587f818b022915c8d491e5af7a6cdab286d90b7d1f8
font_01_sfnt_off0000ffbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBE 25516 bytes
SHA-256: efade6eaced23688c03105f190b7bce24c4922ba56cb93bb09d4d2fd570ad628
font_02_sfnt_off00013ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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