Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe8e56217d52893…

MALICIOUS

PDF

92.4 KB Created: 2021-07-26 04:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e3fbc7b6b1d7a69f046e64782116ce04 SHA-1: c737623422c6d0e04212075d7f7652805064b7b3 SHA-256: 3fe8e56217d528935e124e033fa99680029386669c77667af7fecbbe3c0def4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://pacie.vn/web/uploads/files/38477526470.pdf In PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ab5e08cbfc943f61f6f9c56df21f1e0e/jogokukirebikag.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/97977426207.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/1727c0085d45016ccf27f189e8c65348/72491866923.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/0021c5424c59ce686df793bf4fe5760c/mizawa.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/repodam.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/68747392591.pdfIn PDF document text
    • https://digireg.it/upload/wurobakaxepaviw.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/litupomomerunapupojevidar.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f104d0e55b---14337422001.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/52079048955.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/19669780799.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/vefixobuwukutajo.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dfa6a4f2f---19599368517.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/95504524336.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/nakobejudeduweduguz.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021062601100773499.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/pirejajofowetapujevokire.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/s75jdsi5pge662p65vmetqcal2/ganorekerutibudefaxawo.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/8e4398bb0c85d139fe8109ce739a284a/novaju.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/10240096013.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/08a80b20347891c6cd8d896cedd5920f/78968548087.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec51b355e4---duxozuduwunig.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16085835b7ea93---mupit.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef50a1c8e1---8399067903.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bae7952a7---62338850064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=arundhati+full+movie+tamil+download+tamilrockersPDF 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_off000103c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 17232 bytes
SHA-256: f375cd15f4dfc89fb0f3bb1bd659fcac85ea5f40e348789369f85fd2346207a6
font_01_sfnt_off00013060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13060 11064 bytes
SHA-256: 7b051ee9b23496655170bf08c546dd859e7cbf4ab4e759d63e5cd51520b5db72
font_02_sfnt_off00014a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1