Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce135b87349f5d15…

MALICIOUS

PDF

87.7 KB Created: 2021-07-07 01:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e51a1644e0a68e9725fed93667a1110 SHA-1: a95c3a6a966229a07d1e6dc4c414fde01481d5de SHA-256: ce135b87349f5d157971539b0d3d0927418b2a494de983e49b508fbac9229e0f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and IP address literals further supports its role in directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://inwebjor.ru/uplcv?utm_term=examples+of+british+and+american+english
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce44f4d5a7---93331257462.pdf
    • https://detectiveoffice.net/userfiles/file/77215311932.pdf
    • http://techbis.pl/files/file/68981944170.pdf
    • https://toolsatool.com/userfiles/files/kelolufobabulamelupazog.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aef61dc460b---66139103027.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784a7be0c61---54029664291.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/5c81698bc4eda9467a6a4b1ae2e87198/96517737575.pdf
    • http://157.230.241.115/image/upload/File/bofolez.pdf
    • http://chatfieldfarms101.com/userimages/46503945675.pdf
    • http://shippingengineering.com/files/ckeditorothers/didadipufewinowetomorazu.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de39164a495---18593064590.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/db5cd78c1108a1467230a77f8454cdc1/29852856102.pdf
    • http://wingmanresearch.com/userfiles/files/81831329308.pdf
    • http://kiiga.ru/userfiles/file/69253134321.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/pkp6gvcltg3nv0287m4erdv6n3/23419259514.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee21b0488a---jozolutuvijisuwojapafa.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/1344269f2a05df71af3c41dfd45436e6/75238292301.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5213afa32---323568149.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/17244642309.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82bb087265---37648744300.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a2153ee3850---nijizefafodizo.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8a3e7c54724bdcaf167477e16bf01c2d/lodapexaxifiluse.pdf
    • https://sharadsangam.org/UserFilesTwo/file/63486524064.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21125bca5b---15560685903.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/781890cca16d09964e42049d91aab55c/12119972947.pdf
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pikozotozigopirapuvetutaj.pdf
    • http://blessingsngo.in/userfiles/files/73521182976.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f314.bin
bef69299f25df9854f2b6349a1e5a2b233d146f7b10142f93cb2ad89c82c5e80
pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 16960 bytes
font_01_sfnt_off00011eec.bin
bb5f02f35a4d6ac8871a622e868ea92636a36ce3bd88fd0292ef995822bb2e8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 11292 bytes
font_02_sfnt_off000138d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138D1 16792 bytes