Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd51e89fb823903…

MALICIOUS

PDF

286.2 KB Created: 2021-07-06 10:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ae198089ef91d1328f84d792f7f8d6bc SHA-1: 2b9cd5b94871ffef11f5efee4143ff0592b829cf SHA-256: 3fd51e89fb823903f9104974e399de427b177a44f13125f6034f3c1e024752cf
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a significant number pointing to compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded links and the nature of the heuristics point towards the use of JavaScript for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7225

Heuristics 4

  • 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.
  • 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://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606f683a9942b---67571728491.pdf In PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/patufuvelejazodabelelobaz.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160793cc377b64---lagajofunaju.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f462e5dd1285caf174e2051045137929/47043916905.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/79911785418.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/1fb3d9a3c90cfbdaac47d68be8b39f00/48855752971.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/30852669395.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072045033cc5---75594242125.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9417f43954---45209340789.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1a21c3d95---7318332699.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c786901749---zilukewoludujimo.pdfIn PDF document text
    • http://aimic.com/userfiles/file/64872934347.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb2fc1417e---givixixupukasabux.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/5574c6c8e970788974029ccb3837a0df/58219294434.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d4258d49b751de7a096bf7ef2f607f08/47702549226.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36431543c4---bafidivujivixidapaw.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/noxezamopim.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacc9cc1c6c---fopipafevi.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/252036552f05408ffbf4a5f6ea7ab78e/49836004681.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/5292346f004eedc24e84c6b582bf84db/pusavusefuvojemigumuki.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/901e1ba96e3e06ca60e808a5dfbcd41b/49937000932.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c743997b94a---47577015041.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/ab23b2f3366fbf23a7de80009d4708cd/61832346306.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/34189403760.pdfIn PDF document text
    • http://midel.me/userfiles/file/nixuneluxumewisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=water+distribution+layoutPDF 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_off00043a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43A7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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