Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8062640012c138…

MALICIOUS

PDF

79.0 KB Created: 2021-08-18 14:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7bfbc6ec78c8158aecdee4dbcbf0a685 SHA-1: 86379b30c7c578fd5557b125a0626a9ac587f3d1 SHA-256: ab8062640012c13844a5952d190b8526753278261e79200810cc87b80fc43b64
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised websites, many of which host other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, suggesting it's part of a phishing or trojan distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8373

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://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/2ffbd3a1f2f33a338fd8b2a6babbdb72/zivuvetezot.pdf In PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/7ltmlprerksn8sl5gl6sh8jnf2/29577073029.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/fuxolazof.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf79179d9a---jujanutorixugunaki.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/lejefarel.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/86232369400.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/58942528834.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073524d9dd78---fimitevizefiraxe.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16079b10027fe1---69683556580.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b6857b71cc660bc452efac2575ea23c3/23496671440.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/narenatemilotitewubew.pdfIn PDF document text
    • http://evola.it/userfiles/files/rojovidugutogud.pdfIn PDF document text
    • https://olterus.info/contents//files/jalavekipumusid.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/67339467591.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/69224841003.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/f10772c7bc659e9c0e2d07d567441207/semematojopisosuremuli.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/72773743733.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/tirizijuvumiguwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=calendario+2020+colombia+para+imprimirPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F7 10820 bytes
SHA-256: fd2590ed21f79f190d2d7da897cf0b62fade692bbeb8de6c46bf754a48760cdf
font_01_sfnt_off0000ea9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 17500 bytes
SHA-256: 7600fbbcf0fc1d711d5c8641d1148cdfbcd3bb16a2fa1ed319e133b07428e988
font_02_sfnt_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 16224 bytes
SHA-256: da79484a7f94e028a8871d907a282bdc2df095dfef79f7b1f2af1efeeab75da7

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