Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd04cf28e65cdbe…

MALICIOUS

PDF

73.5 KB Created: 2021-06-12 03:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e90ef5be0d7575bd414ba66031ec90a3 SHA-1: 2abce5e66a341bc45efd1b238d0e03f987b75f26 SHA-256: cfd04cf28e65cdbef5df8b6eed7c24d6819b9fd47ab058ca7099af426bc1403b
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. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a URL that appears to be a lure for reading content online, aligning with a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8924

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://chcial.ru/uplcv?utm_term=playboy+pilot+read+online+free
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812e4cee0e0---59174550660.pdf
    • http://bjaimama.com/data/upload/2021/06/file/202106100200152360.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63caf03488---91308163921.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/se39ni7fuacro2tgm0vngcc094/vimuwuredusozanenegazim.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/db97d8d652e12a56c8fd5db3c86143fd/sonolelafezorade.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1363c13edd---53985102042.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/pfn6gqblvf1fvo8tufl5s1keh4/79867186182.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a34eac6de05---33101716106.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/fd8d17e627247f94cdb4474bcf7ad8e9/sukugaraluxojasom.pdf
    • http://www.buildingmalawi.com/images/uploaded/documents/59773681932.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/f45246959b4511fe735dbb3f1dd26b75/82331603166.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/86f6674616b3235fcdc9d7ba898c0f3c/nekudinalawageg.pdf
    • https://cihangirhotel.com/upload/ckfinder/files/52319411188.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769bdc355ed---xexomitizelorogegeza.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/l5btt83l8nbpe9pulrakp4lsk1/5592052157.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b2588ce5617---sidonika.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3963f2d54b6de497f997d583bba8fcb2/36052903088.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001108c.bin
6715df802e4aa1a6e61ecc41a8ff686d0e3237b0d2b3ca3391da16ce89f6fe69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1108C 5100 bytes

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