Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2ab10a1377dc75…

MALICIOUS

PDF

61.9 KB Created: 2021-05-27 10:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a785b250b4aa65252df8334b0068b9cd SHA-1: f01dd71f5b8927e971684325c8d354489f5c4caa SHA-256: df2ab10a1377dc75e3701d5cb864e41b37987d68a63faea2cab90081287905d3
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 installations, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be related to 'adjectives worksheets for grade 8', a common lure for educational-themed phishing. No scripts were extracted, but the presence of multiple external links and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8557

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://catamma.ru/uplcv?utm_term=adjectives+worksheets+for+grade+8+with+answers
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/vrl98np0kn1il3oitcnldud91c/juwafope.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b300a593b2---77977338216.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/5a2e1b5fdb956057a9d98a60c4c5b1e1/98240278247.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mnc0gog478u3068ku7ha9ejq1k/fulovezaku.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/def37e40c8cd1d113e7ca356bc93a91b/vamilijuvamejejepes.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/87b066d934fe4088023d47bfa6f25386/terunuzudifoguto.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/d0cee3ea7996ea9ad2b76d600b1554af/65312066148.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5099b96b7987ff687bc1aad2aa59eed5/67570151205.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d01e164f---zabonevutakenibigevumovi.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06151c0a4---22466413198.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/89d71c64ec1c7e0bf42e6af6fa456317/bezaze.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/84cfc17f67837d9860853ad69b017a76/59362389617.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/db6fae798351aca0ea41183defe5367b/87608461726.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083baad331f0---miritoririsusa.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/3cf8fc33448b7a84066c8c9ad60e45f1/34096460849.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/26385b9e8f564453da2e9e1a9e561c01/17665776262.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/65768525954.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881c0021e5d---potoxibenutonekivo.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/41a90422c3ed21512b88272a6c179e7b/vizodelujosix.pdf
    • http://domeinbeverdonk.be/assets/files/file/bowenedi.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_off0000e8f2.bin
c02f0e8da3eb830e7ce1f24ce1c9f280ed88572b72f377e0bb85232b339e1b1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 5512 bytes

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