Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9034c172265d905…

MALICIOUS

PDF

77.2 KB Created: 2021-08-20 18:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a01fa37a9a0bd358a470abaf597874cc SHA-1: 1e47428b7d18b275db306cd35aaa464fe7ce4568 SHA-256: d9034c172265d905beaa90e652f6252b88a1ca0ecd4fcd85c14495c54601efcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://irlanc.ru/uplcv?utm_term=libro+de+ejercicios+de+motricidad+fina+pdf PDF link annotation
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822cc620498---80188923407.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160fe7050bd62f---23180982467.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/3tkrqtgdklbs660eg68h8fvea4/lefazibugakugub.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/vikoxusep.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16084165c60cad---nuvoloselomuwilunabes.pdfIn PDF document text
    • https://12tiga.com/contents//files/kuvakevapatida.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e9411684b---jamuwamojivotomejavunin.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/gikovabaxoxavalin.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/f0dhf6dovb5lsglhc6ri4bfkvk/87435626918.pdfIn PDF document text
    • http://4darchitecture.org/img/all/fenevumaf.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/f4a5bef6e9e356fdc2fd6d5216f0dba4/lukezikowalotifoxelera.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a72b53bdcad---62812219437.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf24a758ea---91847462112.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/panadaku.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/8a5c56e9c13f4de07f61f0ae81d5e465/97377002103.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/slnfnvrajn3th1dfb7005kom1i/33066580621.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/24325571264.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/64449132849.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/24af71645a2136c79ccc0b45ae632d97/gojefarenonukezatasivirij.pdfIn PDF document text
    • https://airshow-bg.com/file/88812690739.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/tujadipokuzobabuputol.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a596d023132---fokanivirukijobewat.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc3d9f468---84924566809.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021070212011092.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_off0000c956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC956 10964 bytes
SHA-256: 0f476e47af804f3d156452c93787ca89136190a9a0cc3ac77865311a57fb440e
font_01_sfnt_off0000e283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 17044 bytes
SHA-256: 2bac22aed334c7a545e8c24a2f41403fe9704122ddfd6c230124d36a524a7982

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