Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b37fac0386030ad…

MALICIOUS

PDF

78.4 KB Created: 2021-09-07 04:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: afc221b32930ca48e0c14121c25d2c02 SHA-1: efc841215155d086eeef41d9aab8ad2a792719eb SHA-256: 1b37fac0386030ad82f41b69ee7f8bd0ae943f11a95c9827510475ec90331fcd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF containing embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to phishing sites. The PDF also contains numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161032ad267b63---rajositibanevegege.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k6mqdggupckd41t1f7vhbe7r54/17177144747.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/medimudibologot.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/67639937710.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/99087786758.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/p3e1d5g530nvle4r0j9f4t8no5/sawixo.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/28381744785.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/9m5c8mmjfbcvid6hrb2dofcn65/30997146069.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c906371437f---nufojikoz.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/73150393181.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/53914970446.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/62937733040.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/70863174496.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077af12ac285---viwudululiza.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/87727895952.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/totekuzatovovuzesegavopup.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/47983259475.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ve2mu17n4pmuomn9rvlq32fkk2/83596363739.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/sumosafoxade.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/ximonedutajirapim.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/99218497406.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160777e18e207c---17769305616.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d551a75da---57847970282.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/selezerufeme.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fb4da907d---xabebimixamudadarat.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/65710174035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=braun+wheelchair+lift+repair+manualPDF 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_off0000cedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDB 10696 bytes
SHA-256: 181270b9d8a93daf64cc3c74623e5c7b0881166d3ca1df7fb6f972f4615baef5
font_01_sfnt_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 17456 bytes
SHA-256: b0cf4616f130430969c3a65faa86670d68bb4fa68cc29a198f85577453e6dceb