Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a505c57c0d3ec8…

MALICIOUS

PDF

70.6 KB Created: 2021-06-05 10:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 91e5a6906b690da9d5ea6152d3fe1883 SHA-1: 545176997255ab484fb2b05b18f5ab2c0cdbae03 SHA-256: 90a505c57c0d3ec8c665e5b532ac7c28af7f86552013f0671fcd8287c1bc225d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed for phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support this, indicating the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8179

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://smidgel.ru/uplcv?utm_term=exercices+maths+fractions+4eme PDF link annotation
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/116296cfb54c79bf31d69cc959e72c65/wowizoxirefi.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/7topsq39dpv6l8proi794qppqo/larekababavaxojelisi.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cfe819f3f---65638735465.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8b1a3227---79329763377.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/riwelipamabimegetugi.pdfIn PDF document text
    • https://people11people.gr/uploads/File/bijinif.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/1m5efpqttoulgjo7n04r74vqid/dafopadovukutuxafixore.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/8d55deabb90bec8f10f43bedc64cc0ca/17581936831.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607024fc19ec7---tusupujulirad.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16099fa6f0ba93---71414433607.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/0f7773adf8ed26ccdba5300618f97d1e/43899774604.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bab0d68c138---57867466682.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebad19002f---sajuxelakexajamu.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/1edd51311a281150f109515d3a679b99/parixatikepevov.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/8dtl4eubd18b4at4vvnfeibne2/selazafiwoxojisiwiv.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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEB 5200 bytes
SHA-256: b3b43b8f71688419980c3a89d46a09a7e87d7b605199c195f83cd015a8d4ae7b

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