Malicious PDF — malware analysis report

Static analysis result for SHA-256 216ff3cf3b419815…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 17:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 190936ec8bdc3518858690aa458e16a1 SHA-1: e444683d35211501d31346ecd2e63cb69ecd013f SHA-256: 216ff3cf3b41981563b93bbf7e724b24911887b244ec18bbe59682f6f7134293
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads or exploiting browser vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://philabc.ru/uplcv?utm_term=inductance+pdf+notes PDF link annotation
    • http://blessingsngo.in/userfiles/files/vevomarotuxe.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/24776291536.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/70368675690.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/dexuwuwigokawux.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/sejis.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/35934217123.pdfIn PDF document text
    • https://mar3ol.com/Files/files/78352338704.pdfIn PDF document text
    • https://ocbond.org/userfiles/files/kebunokajezopegidu.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/5a5u282cuan71leamaj3fco7tf/xadirosabewoverelavofim.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/85473239458.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/992cb7b5c138bc151903dbcfe631b84b/zuwimobejedine.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210622_414A413877B467BC.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4010aa4b3---39986693082.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab336f43e01---4139764521.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/fajusovod.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/59503536254.pdfIn PDF document text
    • http://classtool.info/upload/files/32934365947.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608731298e05d---fuzezewagukuj.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/44216308217.pdfIn PDF document text
    • http://xtra360.net/campannas/file/pupebopatuginagefuvameja.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/9699445834.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ac3dd1148---pomobaninosisifetofuja.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/4289823866.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 10428 bytes
SHA-256: 586019985cd146f8d3006636170691c1050ecf6d987f60d17818055244a01c1d
font_01_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 18224 bytes
SHA-256: 27ac4fa02d709eb2d3525f869ade34d9d821612cf2ddf9c9078d2e18d3eeea79
font_02_sfnt_off000124a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1