Malicious PDF — malware analysis report

Static analysis result for SHA-256 425a3f6337543c27…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 05:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: db20d554d59867d95e5d7926f9f83ca8 SHA-1: 81ab1169a7d043566fc61f2a447cefdd635f81f6 SHA-256: 425a3f6337543c276ee1f356c21290f1e3a7e00ed5ba1552904d8106c31b1b1a
124 Risk Score

Malware Insights

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

The file was detected as a Trojan by ClamAV, indicating malicious intent. Static analysis revealed it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF link farm heuristics strongly suggests this document is designed to lure users into clicking links that could lead to further compromise.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4740

Heuristics 5

  • 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
  • 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://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3de6c8ffcea50b64f1ee2016b074bcc3/betiwamafuvugibodudasigo.pdf In PDF document text
    • https://mariellatriolo.it/public/file/mavivozizupibosomipe.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/b6581250d4b3e7172992be547dc6120b/gixejipobuvosulis.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/61967932593.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/50520822375.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3fc76288e---82674552328.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/t7j9m0ar6v40c19em9dno7rpo9/fodutoj.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/gazodoxu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/82601c2dc835a9409988e0b0c59458ea/18621318178.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/lncu09uusp88a0lv0f2nhfn0p2/xaxenobit.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-8-26/20210826042227283919.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/89616597402.pdfIn PDF document text
    • https://educhina.mn/editor/files/56328580066.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161106330bbfa8---vovebagetukupiw.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/3316394047.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/jedug.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/31822725923.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/75632287710.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/18038806527.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883b7c42c24---11311959477.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/62170458580.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/95042995564.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/13198657227.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/87015467025.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/98f40af34d1ccf7339c25b98fe111291/vibobenegovudebininexuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ai+suite+iii+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 17964 bytes
SHA-256: 1be33b2c5291e227ee38ee8754d68da2a1f55455a573de8e0635643ce71ac66a
font_01_sfnt_off000122a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A8 10308 bytes
SHA-256: ed4de572c31a193694d2089fc495c46301340409d2f150e08c6a82047d5f7866

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