Malicious PDF — malware analysis report

Static analysis result for SHA-256 14b24adb96a51b4f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-22 09:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5982784cbf5f04bf273a2ac371b293f6 SHA-1: 78f69a1232f511c1e2c7c596826630eaf42e1819 SHA-256: 14b24adb96a51b4f564585c7a75ff5bb16d3486a40b6a26f03afe1bc723ec6a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and a large number of external links. Several heuristics indicate this is a link farm, with some links pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious sites for phishing or further malware delivery. ClamAV detection as Pdf.Phishing.Trojan further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=must+haves+in+minecraft+survival PDF link annotation
    • http://pc580.cn/upload_fck/file/2021-9-1/20210901223753628152.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/losofasevesugesor.pdfIn PDF document text
    • http://www.og2c.com/images/file/vagojederosabit.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/xasov.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/tejixivetefudozaboparu.pdfIn PDF document text
    • https://egf.tw/test2/images/file/ralarajuw.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/49471303233.pdfIn PDF document text
    • http://rilta.net/userfiles/files/dofizes.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/30756289151.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/41540463189.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/fexajobivefokupuzobaseset.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/44059631710.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/samisikezitefutopufi.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091720235073499.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161457d5b25788---tewekatalekewusebaga.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14051673152.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb2619f029---dobudizizamuxupidowi.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/91044518056.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/wawinogemilefumegowum.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/kikifiruwadatomisuxu.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/33017352707.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/82082745420.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8a27e35q9tc6i7gf555vnqrcv1/87547018570.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/tafefobo.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/tonubuvejaviwe.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_off0000d86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86A 17580 bytes
SHA-256: 74f1d873d832a57b39fc0cf8b8f5f55de8d2034d16d1bb29ec9a2bffa1fcff04
font_01_sfnt_off00010629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E40 10640 bytes
SHA-256: f145da317eaa3c52e8a8ca293c0731d44b706fbbedce21959284f164e29af17a