Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30c178eb708c303…

MALICIOUS

PDF

101.1 KB Created: 2021-08-16 13:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a03ebf596fece3db0f907c844787a4e4 SHA-1: 77d5846975f23d58181f5dd27afd15965e048edf SHA-256: a30c178eb708c3036f1fecd03d81120d78bc6458bd3de1be8394af15c7a72a64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to download and execute malicious payloads. The presence of numerous external URIs pointing to compromised CMS uploads and disposable hosting further indicates a phishing or scam attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://insights3.com/wp-content/plugins/super-forms/uploads/php/files/60829a97aca2c42d2f6080f1930237ac/pumufawep.pdf In PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/5571246093.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/47226935023.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/fepazufemutanovarapupuguz.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7faf70f97b27570f165c57154b1124c8/jexitaxujif.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/9631d4f88b1e10d8dafe29d4ada367e7/91246629825.pdfIn PDF document text
    • http://omg.su/upload/File/46205448447.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19a95f6c8---werutuzibugikokewidoxum.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/sujagoveze.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606fda04008d8---torajoxizanasaler.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/tmb9pa60nale7a1spqjiptj0l7/80963936979.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/4c4af50844a994baf7c63470348b0b5c/tasuxagarox.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/tibaroputewoviki.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/23718885445.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160846006424c3---lidusavulidorikubifeniri.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6843ed042d1db6d59e0ee04414c0c82/rofuluxoxewo.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ea20dacbefa13832abe99be0906537a1/besedure.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/famusetijulo.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/70692875914.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a28f5999641---57720836907.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/mujawivurubu.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/kitidasitebumodawu.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/378fa2c91e1def9960ba9b38da7aae00/74788420498.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/juxekuzigukokirisefululu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608af113e69f0---godonozutiferola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=guinness+world+records+2020+pdf+download+freePDF link annotation
    • 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_off0001241b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241B 10980 bytes
SHA-256: 9929d579aba3ae18267dbb72a31a1193603fae4a5c4861dd799f22ffaecf4f9e
font_01_sfnt_off00013dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCA 18552 bytes
SHA-256: 2ea64cb06139a2d68d4610577d335f4971844b120104acee18ef680eea147237
font_02_sfnt_off00016ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1