Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d13e30a2c93bd0b…

MALICIOUS

PDF

87.5 KB Created: 2021-08-14 20:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: bb06ddaa93a0d2dd58199b3d0eb55277 SHA-1: 66e05d6c449c2d4f5f5e7bdd94a47f14b7be02bb SHA-256: 5d13e30a2c93bd0be11f739f3217673aeaba26dcffd4b7919a66113397056a39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.fishandcosolicitors.com/uploads/files/dutaxob.pdf In PDF document text
    • http://nhaphangmy.us/upload/files/92146841628.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c922e39427a---67029384297.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/tt008kjehj6gov0sj2jtm1matb/mevurazoleteku.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/68344855804.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/9f17fd40315d389bb691d303db11f72e/28334982040.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/panopegalulivew.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/mutoruxosi.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/lonerozu.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qllur8dkj8kkv12kavvqr1i8sb/21252481298.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/82739540620.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd2e69163a---fegeke.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099eb6cce5e2---67459346429.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/rulifipun.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/vaxome.pdfIn PDF document text
    • https://anfauglir.com/images/file/nekajadetexitefekotep.pdfIn PDF document text
    • http://northjerseyseniormenssoftballleague.com/clients/2/22/22e10641a135963e7b476298ec508c3c/File/kelonudokeg.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/tebogekuvej.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/73767610914.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/givinipexir.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609849657cb5e---54565021592.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/42911a57710011e600f6bde2d170febd/konev.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/70669634412.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083be4d14da7---91123188665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+annotated+and+illustrated+double+helix+pdfPDF 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_off0000f2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BA 16968 bytes
SHA-256: 58d9ba84dfd6e444b81a7835ac7b9297e0cd8bc9bbe8850c9d2858217f35c1f1
font_01_sfnt_off00011e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 10900 bytes
SHA-256: e170d0ef037132ddf2ced2d08f62d2d1625527c16874778e0020b9304f1def55
font_02_sfnt_off0001376b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1