Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb3fc368ea3abd1…

MALICIOUS

PDF

75.5 KB Created: 2021-09-09 07:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f297e1a10355f709cd80e5b672a69d92 SHA-1: 6909369c22bc2684326d11e3907bd7fd95b1331e SHA-256: efb3fc368ea3abd1d49bc069e522badf23cbb0fb6e008c7c2e23de4701c7c7ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable or compromised domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to T1059.007, and the nature of the PDF as an attachment suggests T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://caythuocdangian.net/images/files/xelafusuruk.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344ee24dc9f---wirola.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/49184107990.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/81502791088.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zeperufujurivijixa.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/rumarigikexulebasimalijon.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/57739828576.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/13355664321.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/kuwejamutudufukugud.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090419284873499.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/96150535801.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1561746605.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/potelubumebirubevepu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139785f42c54---zozelomegejaxab.pdfIn PDF document text
    • http://osayit.com/images/file/wofurefef.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/kubibubuzemux.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135886310bbc---junejugewarazutatuditus.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/60844053035.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/10068170548.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/91647681836.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/porasopevaviloso.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/54075968628.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/wefikalanet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=it+chapter+2+streaming+vfPDF 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_off0000bd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD82 10900 bytes
SHA-256: 2b864e7825b3222041334ace17b665f53a1f40e96c583a9b00f976c28436c38a
font_01_sfnt_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 18948 bytes
SHA-256: 6c31692ba23f4d426ae3ce5c3efffa4a2a41d34a2554b2234d363873b79c0d0c

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