Malicious PDF — malware analysis report

Static analysis result for SHA-256 13217c7f5dce0979…

MALICIOUS

PDF

86.8 KB Created: 2021-08-01 16:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 25bece749668be1ffd5dc9028feb807d SHA-1: 9f92e47808d1f9a48dc2f9393dc1879b6e9d2c2c SHA-256: 13217c7f5dce09793ebda07ba373c12287df1b460d80ef95c19a9bea98045479
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=magisk+manager+apk+download+android+9 PDF link annotation
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c87a4976572---36207779758.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608110af080c5---7363650162.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/bcc92c8251a4b069b8f0a6d244ea5588/lofuduzoturomi.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088cc0fc3851---lidum.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/kfojq4e07d1r1irho8r360fvfd/kenuze.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/fcug00m2mfk7vk81n8jj6m75bc/sozimexapididisuvidudar.pdfIn PDF document text
    • http://tcihk.com/userfiles/39367865998.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/58042979405.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c87d4e5573c---45824634223.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25fe9ae525---ratewofekaf.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/femixepenatasigakazuzoju.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/98058169112.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/85529814851.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/387vor2du1dcp5v6ie7q2jg6fs/64835259896.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/rekitor.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/51859910033.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/wazojaxekokidar.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a77ede129---91284064762.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/bujufisep.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/ff3d010e7f5df0f7c3a1c06df6b472ad/sasidolejofevuduki.pdfIn PDF document text
    • https://xistenze.com/files/files/46095806945.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/vupamijidizimupun.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070ccf5ef959---guzevurinobol.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad5fc479d2---zojomarasasulusejute.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/vedolab.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_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 10976 bytes
SHA-256: 51f7debc437fa77316f93ab81758e18c17eea0c1cc280752d2b0388cee5f1159
font_01_sfnt_off00010683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10683 17696 bytes
SHA-256: 93c383e8f294052757fc679f9a52d202938646c3b2cdc8c483ed51119fc0c145
font_02_sfnt_off0001352c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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