Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ab4eb3f7faf86a…

MALICIOUS

PDF

81.7 KB Created: 2021-05-21 18:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bb72389389745b86b6cb97a4c5785ae SHA-1: b7ecc8ab39183a151afdb619dd7b2540027fe83d SHA-256: 82ab4eb3f7faf86a487d2c5aa6fa909a0fdc6bcfd1f34259fefafc88f049294c
154 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous URLs and the nature of the heuristics point towards a phishing or downloader attack pattern.

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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