Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0cc535baf6b155b…

MALICIOUS

PDF

88.7 KB Created: 2021-08-13 15:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d41fff481d5eebb661d6f0b0ebdab000 SHA-1: e6b2a951e46926b8f1a6e012c618460753b57912 SHA-256: d0cc535baf6b155b1bd7491d919f736f90b9b608450084f9363fcefd1eea0062
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and ML classifiers, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=how+to+calculate+car+insurance+price PDF link annotation
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888847c1e1c---tupukudo.pdfIn PDF document text
    • https://ags-car.com/upload/files/26979004246.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/92515863540.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/13753206357.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8056d548d---pevobuvobokonu.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f82ab36cf9---84971318414.pdfIn PDF document text
    • https://wsbtitan.com/images/file/werawovixotiza.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/54a505d47012b96f23eccbf5f9be2e24/99010929559.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/fujipedasizarozuwife.pdfIn PDF document text
    • http://www.celso.org/download/vakimesuwezuzabi.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/vezasamoxo.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/pinerenupigeruvudaxax.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/56eab816ffe7499a519e372dd15f6acd/zivogobokatenufuloj.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/9566197898.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/19957006862.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/mafenelurujutajo.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/92323961468.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/selemofetafiridepiluxile.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/9lt6dpmrv18esl6op3pa3un7rd/sozupibiz.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/lph472cd5l5qphnnf3vo1d6kil/83101520841.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/fc93462f56b8cd04a8a0cb19b2c2b174/nirulitexelilo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/f8u59vpqfv2vk3o8ke702fjdt6/zidugoginevureviganusibix.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429133627962586.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/4q3dmd5884j81mfbtrn09heun2/18438926286.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_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 10544 bytes
SHA-256: cfc539efb4c1b6f31ab9b725dd7676661a02250a6f36b1a123f72bc627a3ca27
font_01_sfnt_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 17216 bytes
SHA-256: 8dbf614fbabeb1dd3e2998e0dea8dfce125eb17e1e1c7953d3da2dfa9220aa3d

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