Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c1817cf5dbcd6b…

MALICIOUS

PDF

74.6 KB Created: 2021-08-03 21:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 977e7366c6708b44693c8efce97d3ec9 SHA-1: d77cd847af163e3a9d5e1e6c7557b209323c8f66 SHA-256: e8c1817cf5dbcd6b6493aad32fb91be0a57d7da3ef1fc96c3db746f91b79970a
154 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The authoring application 'wkhtmltopdf' suggests it may have been generated programmatically to serve this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9162

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 http://aristosaigonhotel.vn/uploads/files/gomuramo.pdf In PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3a33f43a---63012295869.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/45498611148.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/51094368110.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070f7acb8b18---67318703168.pdfIn PDF document text
    • http://metrokentakifinan.com/resimler/files/97677825424.pdfIn PDF document text
    • https://dafelia.com/files/zufuzeba.pdfIn PDF document text
    • http://amdind.com/userfiles/file/82190632773.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/sujaro.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/nagikituf.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/62087638235.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/79552854061.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160812a75882af---85414894306.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa6b4f948---35356680495.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa7f35da30---38129042665.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///dofenino.pdfIn PDF document text
    • https://songhong.info/userfiles/file/raveku.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/mulekurujijumevozejusenu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f30caa5e9a---94252251570.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/mosufuxamimupumavu.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e977d07491a---12505069946.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/16846806411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gigabyte+z370xp+sli+pricePDF 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_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 11124 bytes
SHA-256: 9745ed3d15a00a6f8cf9d4b832f0ef9788fed60eb2109b903b6b26996d22b1c3

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