Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7330724aa09b6c1…

MALICIOUS

PDF

78.6 KB Created: 2021-06-27 11:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db2894eb2c40cfbb2dbb9aecfaf57815 SHA-1: 16070fda670550f69b7bc4a323bcccea06b871a2 SHA-256: c7330724aa09b6c1c705270e312fa5f1b471cb3dab16618ceb541fbc2b9d4540
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of these links suggests an attempt to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7547

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://cmetrix.net/ckfinder/userfiles/files/zofokeregosujidis.pdf In PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6ab5bbea5---garezimagomofaji.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/gutofunupi.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/55298206050.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/3b07c1c9869702c8ff99609f1d4c5fbc/takupezigojiduvepi.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/332469bde608b4850656af84fe0a077f/kolajafokiku.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b797c0df24---54740143314.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f9qonirv52bs26druloq03der7/befaridisalomojojiv.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098299690586---12782851003.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/e2293cfa30cd0f3c3427e5597d3e779a/jezewel.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/71463094900.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/54254311588.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab257a6e3a3---5925466050.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/50838072195.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2b8076d9c---baxobinatakebofetab.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/bapuvusiruteziso.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/19760960505.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/mikudataduvurabo.pdfIn PDF document text
    • https://mojer.bg/files/94445955479.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f97a948107---furejozowejuwibifogoxene.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0287535063---wutekup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=round+to+the+nearest+10000PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 10524 bytes
SHA-256: e5059749168074c213df1501461a463c6864492a17e2d16c1f24655f5d2f683b
font_01_sfnt_off00012572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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