Malicious PDF — malware analysis report

Static analysis result for SHA-256 1489ba7994a8ea3c…

MALICIOUS

PDF

82.9 KB Created: 2021-05-21 18:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69c9d19f499d4150624acae17f3737bc SHA-1: 08ee9e61276da33302ad316c025b069d2e253e18 SHA-256: 1489ba7994a8ea3c13d44aae7c17f008f315bc2071712fadc42df17b00a5c796
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 a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious payloads or phishing content. The embedded URLs, such as 'https://krisoc.ru/uplcv?utm_term=vidmate+app+download+install+old+version+2016', suggest a lure for software downloads. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8057

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://krisoc.ru/uplcv?utm_term=vidmate+app+download+install+old+version+2016
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/f7b7118b2c208fe7a7cdd3304cefe5a6/genawadojunigejaxix.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d11212e4ab454c6fee3e1f2a49a23d8b/97994928488.pdf
    • http://batiment-tunisie.com/userfiles/file/88223589662.pdf
    • https://bodegoncriollo.com/userfiles/file/nidimexufigikof.pdf
    • http://beerskiboot.com/img/upload/file/rijabopogejebojute.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096308686f13---5462855482.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c67274d516563f841ab6945293217845/soxefixefofezupiruwoxaja.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075475ae8e3a---23402500135.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a02f4ac339---bosisab.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/88cbc9c1658aa66d19ccd36c56ca8883/fetesikap.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77857c58af---38388390687.pdf
    • https://africanresearchcenter.com/userfiles/file/vibamowexiviruto.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c3fd61b36---wetegipoligo.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/bb50afbaafe291ce78888d0e8776513d/gekeragibabu.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_off00011c00.bin
5efdf7d5e748f9617986b086eaa985eb00d04fe6129b5fc2be684e73b467252a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C00 5700 bytes

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