Malicious PDF — malware analysis report

Static analysis result for SHA-256 5083a8a54c87d406…

MALICIOUS

PDF

89.0 KB Created: 2021-07-21 17:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d51e42423e28fbfe23eafe52d70421c7 SHA-1: b36d3efc80ab037554e9f8fff178402ceda69f0e SHA-256: 5083a8a54c87d406ed445ffedd9dfa148aa592af5e75868562583bbec678cc4b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs to redirect users, likely to phishing sites or to download further malware. The presence of multiple unknown URLs suggests a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://chroscina.com/userfiles/file/podisorezevijotasolur.pdf In PDF document text
    • http://studiogallerani.it/userfiles/files/bifoxalome.pdfIn PDF document text
    • http://airfa.it/userfiles/file/sefobebudapexojinup.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/fejotewonixusisiruroru.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/761118624.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/2029e224cc83db696e9b34755692c939/juwazanefuwifif.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9c560260cfb0b7ca7462d9f8d4f7f79/61796344254.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/tikogunumuwarobidaxowefe.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/74100430022.pdfIn PDF document text
    • http://thevenetianmask.com/clients/71561/File/95479384271.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/22205287957.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/57688106260.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078537d969be---65056836092.pdfIn PDF document text
    • http://www.520amis.com/upload/files/66565552953.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/fbbdd5dd4914d3774c1669577a01d101/rimokunikidolimofepig.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/vamopiditutab.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/11003922200.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/pozezudiba.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/40545420004.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/98697543433.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a64cba53926---13514386211.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/94824804974.pdfIn PDF document text
    • http://rideco.hu/upload/file/zulifajogafadaxodokenuni.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/daxoriso.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833aece5cb2---funurogopavuxopo.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d327e2d90e---wazijogupatutusowovibi.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a53c5f4320d---40262747035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=just+married+car+clipartPDF 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_off0000f817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001102e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102E 10540 bytes
SHA-256: e1726556a75d392c68c164f20435cfb840511d2f6b8ab5e7528d6dc36d465410
font_02_sfnt_off00012834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12834 17480 bytes
SHA-256: 77bb320691adbc270f0199cdadc4978fd2b83e0fb16b655d61c1c1ab2217206a

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