Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3876263b9ea4058…

MALICIOUS

PDF

78.1 KB Created: 2021-06-18 14:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0789ba58e70069c23f05114b2200fdd4 SHA-1: 4b0448b109468050b9a345c8059f60c6aa06a74b SHA-256: e3876263b9ea405875e8c0334563047b844fa5fdbcaa6005d4af24914a659270
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9102

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://1877painters.com/FCKeditor/file/ruvesebapamub.pdf In PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160758769c94bc---mozamikesu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d117b3bc23---bovebunimukazukixem.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/kusaxaralen.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bba73164072---29925609262.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/29369365515.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b26dc886a---34413856138.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/hl656iv86d92abuk50sspvop45/56207476945.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/jcnhf64kdp31te4e7934h3b1v3/29239401276.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b2661ffff---vemasizakalef.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608922fcbe9f8---resapolojizemigewopoxuzek.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/24859301207.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/54970840526.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ed970110515900ddac423a6ec5a27f0c/dololadugido.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/131bcf3a4dba654cbd28fda45083bf75/makesore.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/32391799671.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=emoji+ios+12.1+apkPDF link annotation
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 6548 bytes
SHA-256: a16d78b4e765d5ee2bbe34147faa0d9708ca9f4bd36cf3b090d8d65c0d41a973
font_01_sfnt_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 5148 bytes
SHA-256: 5c69b7646ac501e4735a5f6bca9acb81259ece0d0394cd4c2dd9cc61bbacbc76
font_02_sfnt_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 3256 bytes
SHA-256: 5ed6e4cde9804796643b82ff9b519584ec4efcf48159fd3bf418b8b0042c4628
font_03_sfnt_off00011214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11214 11124 bytes
SHA-256: 550ae69d2ed14aee7445a53388f48a3b45e5d2a4b90f3fb90928e0a1f7df6f4b

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