Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefebcb2e62c1257…

MALICIOUS

PDF

87.3 KB Created: 2021-09-21 02:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0cdd401323c71c848a94d5266f39d1bb SHA-1: e5791fc4fc92c1d5dc92a2f29ebdcd81b34113e3 SHA-256: aefebcb2e62c12572aaf0374476c28a72c8679ec57c4a06bd4c836f0ffb1e50e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the execution of malicious actions or the redirection to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=cast+android+phone+to+computer PDF link annotation
    • http://falegnameriacastiglione.it/userfiles/files/94943051159.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/98152438341.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/jazumigalozunekovu.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kotadeximopofoxosodutejon.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/clkuk2v1ua84mkv7q0g46gjme1/41608590652.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/nebobajuvugesewowup.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/71178367023.pdfIn PDF document text
    • http://live-net.it/file/ditofekakosizenutirudore.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/13373070118.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/durisenalupizudazilowef.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/97035926842.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/32727387613.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/99277693023.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/bumuzakirovoropodaganax.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/42366264911.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/n71frgkf6h082cp8hptl9s0fiu/68141611098.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/metusanojexolofad.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/65050856141.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210903_D9ACC367991EBA93.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/50437237137.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/81565536505.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/82222854611.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/gb2875vdbt346e1ga48sd54174/80593352961.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613c370dd4134---94971597158.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/87453154472.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_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 17656 bytes
SHA-256: e2ae19bf309cd36fec01ca572de9975c7a52b102169fd2f6b196e17bce0d7d7f
font_01_sfnt_off00011dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFD 10864 bytes
SHA-256: 1046292dac09e1069cb17c8af883ea7f7c6619db99f2800e34fba5eff41d724e
font_02_sfnt_off000136e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1