Malicious PDF — malware analysis report

Static analysis result for SHA-256 16daaa1bfd87db80…

MALICIOUS

PDF

76.6 KB Created: 2021-06-10 11:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d2d4958339d6c5d6d9ca41013994092d SHA-1: 2d45c5fe86f7049fafa586a1051ad709f61fcd25 SHA-256: 16daaa1bfd87db80f7198043e55f6c53eec17880601e2fe5b33b44c622e6f21a
154 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and other domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7381

Heuristics 5

  • 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
  • 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=nandini+bangla+serial+2020 PDF link annotation
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160890562e883e---foninamemo.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/53934515377.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2af9aeb4b5---vuporurumedeluxa.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160838921a876f---nupomibagutu.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/kazufelano.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4bb72040cec952934f2ad2d05adeaa97/wopenalox.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/96134811491.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/junuv.pdfIn PDF document text
    • https://jagominum.com/contents//files/sanofer.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e31f8e204e74106251ed82c015c52ff7/pezupatuxabifani.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/92152413494.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/2b7fbd505a399bd2dbef54050c85b2bb/88942612366.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aca083f1bd---85580377547.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/d8bc3d49120f7c23f9378d71fb432d1e/89182418946.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/c7822499f4942c72d54c08b950807024/gutafil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD887 5376 bytes
SHA-256: 99442ddd51ef9c91c291a5993d3d5b491549b651a550360c33738c842f148b36
font_01_sfnt_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 10352 bytes
SHA-256: b1ff722a66776462757297650481743bd5b9bcc7c083908d7886c5807b4fff3e
font_02_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 13436 bytes
SHA-256: 6df0700408c0de084dad73c786ebdd91b893d5528b9c12d9f540f78a734fe7e2

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