Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da9e3423ed267cd…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 21:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 083603cddbacbd1c27b8d49202e64f7b SHA-1: 4f2856a040a5653af72db2d82832d1a5777adeea SHA-256: 2da9e3423ed267cd73a8a71cc95f4412902f89999e55396422c474cd6b75044b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, which are likely used to host or redirect to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and potentially a trojan. The presence of a link farm on compromised CMS uploads suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e7004fbf2---9378023792.pdf In PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/mjngvivfl91fcfl1stqnhmj7j3/nagenekanip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12d5d710ad---dazajukonewozuwokolufugug.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/vdbkl222jsn2a5ctuvviu521fh/pugodexiduperakul.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d42efc7bcf---bemosoxogol.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/66186638208.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/a9fb0a62c44b4242e1c899c1622f2ce0/babibabasinejafijonusofun.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/742bbe488ff81a8c1fdeb40b40de55a4/33942541592.pdfIn PDF document text
    • http://lelit.nl/app/webroot/files/userfiles/files/55872286488.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/59783894046.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/fefunisi.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/uahhnnvd3r0afupbiutnbne9q6/runotiduf.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f710ae6d8b---fopivejerelefunelijax.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/99407381970.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/i2n89n792efakqbijuqv584lf6/goxalevuvojukiwofifagixin.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/dd8fd4d0bbabce0ad4eadd328738f7fb/2946510179.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736bd8d54bd---73998883862.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9c1411f498781240b3bdbe874085a613/66288781893.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/l6upt7318tdvt8rak2255aqd70/mokokewobebogogoxufivi.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d401c2a08de---sumunijesosilasemes.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/1410c330449f0130d1a1541f92269370/68345220079.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/fbb577170a757092e3e60bcf260caef5/30174465794.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae3e4c708---82812977100.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16096ecdca0540---xuruzajevabakesibegowijus.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/84104932784.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090070d42c7b---66985145557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=famous+female+cyclistsPDF 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_off0000f62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62F 17180 bytes
SHA-256: 8620f2a3f940a6400108cb347b2b6b84eb0b9798f8d8441f63584909d0a08043
font_01_sfnt_off00012286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9D 10484 bytes
SHA-256: 139d15d53be1e156c5d8d6a1120cd9949625fed000847f6372ce59e3a62cd539

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