Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9761d85dd8dbc4a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 01:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f83db0fd073b65ecfcbfd95356eed3a6 SHA-1: fd8fd0ecf4cc2208fcc3e02f2216291e8c7a7c8c SHA-256: f9761d85dd8dbc4ac2b61f1fa65a44ce1f5eefb868ebce35f622f4118e4d6159
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript indicates a potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://studiosimonepantaleo.it/userfiles/files/nofedapidixiduwurupikizim.pdf In PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/xokatakufinesenawiborozu.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/wakofigotilumazokebane.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/jararejajor.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/56866777413.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/pimabe.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/9920885805.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0b27e732fd23f30a6834954da39add85/rixosevirafexuworopade.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf6e85d8b---dukisuwilabexexuwevupoke.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/86565018665.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/pafataruwazapupoxamupolo.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20219464826918.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/kepafegumunukapapal.pdfIn PDF document text
    • https://ms1oke.com/contents/files/zefegilusunutus.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/sajoken.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383ae9f2e27---kibesadozekupotidar.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/10875231409.pdfIn PDF document text
    • https://rubfila.in/files/file/wejavigofawunamujiso.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/84749878490.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/33008799097.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/76987420709.pdfIn PDF document text
    • http://charontrade.hu/data/file/tujuzepugetomibaxixasobo.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613131b92a4b9---7574734318.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/woxupuba.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021971638255462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=download+world+clock+apkPDF 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_off0000d578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 10196 bytes
SHA-256: 7509fa3d28222577285d6b42b92d4c61be0bca0d8c677a6cb99bb8684542de11
font_01_sfnt_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 18660 bytes
SHA-256: cfbbb815c6eb9ed556028a3818d6162f1022b0d9fddaea3b724b68be3aba9547
font_02_sfnt_off00011dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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