Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5ed86998f80d4c…

MALICIOUS

PDF

75.9 KB Created: 2021-09-19 11:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d8a284f56274959bcc3b44ec7698901 SHA-1: f3c5fb21b9bd004a5d2226c6d2b62ba935ccf636 SHA-256: db5ed86998f80d4c9bf1c58e7b057c56f9e412255b46b2f6a5582fe9bb934b55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=a+teacher+2020+123movies
    • http://www.valathors.com/ckfinder/userfiles/files/lafazuromisofixomatorit.pdf
    • http://thegoshow.net/userfiles/file/5971907939.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad740dabf---guvemozazitego.pdf
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630979902_b4689e1350.pdf
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/josasipifesaxifu.pdf
    • http://neapol-m.ru/usr/file/95881790928.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe1cb8fab5---62463661243.pdf
    • http://pulsarvn.com/media/ftp/file/lejafovibetababezez.pdf
    • http://daiichigroup.net/uploads/news_file/39641557462.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/2c35ed9dce8ad93d90ac1ca0ed758c54/80146245343.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614480fad6842---99418397881.pdf
    • https://botroul.be/uploads/16692289097.pdf
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/49232769018.pdf
    • https://thegmsbihta.in/userfiles/file/dukudokawosimivolameg.pdf
    • http://tavaszitura.eu/userfiles/files/61612857779.pdf
    • http://purepassion.pl/userfiles/file/63175397825.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/26709237458.pdf
    • http://airsoft1.ro/files/file/90458717693.pdf
    • http://tutaylamhet.com/storage/ckfinder/files/tejegat.pdf
    • http://gesundezellen.com/neu/userfiles/file/30387236110.pdf
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/68525064126.pdf
    • http://platcometals.com/images/file/67407416130.pdf
    • http://susasoft.com/upload/userfiles/files/natipekidesojupitogu.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/274ce85f5aafaa0afd517bab50b3dd4d/90002745214.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614658b296a05---53662245091.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c05a.bin
5fca77945028ed25a2f2f2cc6b89b8f1a6d428687ab12b4c7c43a2546c35e65b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC05A 10860 bytes
font_01_sfnt_off0000d9ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 16792 bytes
font_02_sfnt_off0000f1bd.bin
359ae2a3929be17a43c8f237a9856aa46b17262dc84377e3dd55e95bfa53c551
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 18816 bytes