Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11472c0f3a89530…

MALICIOUS

PDF

69.2 KB Created: 2021-09-22 10:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c74b788b7a5237c33791d1e6d831eb16 SHA-1: 821f14b949546e3bb12f354516586ea177750314 SHA-256: b11472c0f3a895308858e111bc139318b9028340e2a59c9ee2384ed5d33944e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a link farm pointing to various PDF files hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the link farm indicate an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7435

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://art-eria.pl/mandarynka/pliki/files/pokemi.pdf In PDF document text
    • http://airelimpio.mx/img/editor/file/6109488794.pdfIn PDF document text
    • https://kawanmto.info/contents/files/lelegoninulegale.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/sakikotatolo.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/84518000885.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/04a71df6097e8c71c52b6f2d4dbb6480/dibomepux.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ba0cf31ae---81048543674.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/xuwefuworozepizojoxewo.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/vojolewajuwafimovexin.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/xatuvododekapakemi.pdfIn PDF document text
    • http://kunbot.com/upload/files/90470138294.pdfIn PDF document text
    • http://vejwun.cz/images/78398958423.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16138c7081427a---sozuwibadabowu.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/kamokaxobexakobupoloditi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f1619f289ed7e07d3e5ed7b10d8d0881/35016869352.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161365e323ea02---67800267251.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/kuxilalixozuxumikufidebod.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161468162b08ae---52013043808.pdfIn PDF document text
    • http://jinyezi.cn/upload/rolaxuva.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/22456430700.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/pakonojakeror.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/kanasitezebojugerojoti.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/zofezalakiwogakosuxerefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=stream+a+christmas+storyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D8 18400 bytes
SHA-256: 0e8ffeb6fbce06cba3fd7bcdae6f942530779aabc66490febf851290acb73894

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