Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54926da934f070d…

MALICIOUS

PDF

74.1 KB Created: 2021-09-22 23:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dbc3aad17213f53617295a3adaa6266 SHA-1: 7c6f23ecd1b35de341ef4f5c05f02747f8b47fdc SHA-256: d54926da934f070dea2e56de2bb740e2f36690cf7adc7644cfeb729e60a9fc4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs and is flagged as a link farm, with several pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://stapper.de/sites/default/files/userfilesfile/24189734030.pdf
    • https://capital-publishing.com/ckfinder/userfiles/files/4335125040.pdf
    • http://krakow4you.pl/krakow/files/33769426585.pdf
    • http://degrossier.nl/uploads/file/99355041042.pdf
    • http://woodbridgeabw.com/uploads/files/47611139536.pdf
    • http://woodbridgeabw.com/uploads/files/58819418318.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141f2e991d02---22497342251.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/rurododa.pdf
    • http://drprdesaihospital.com/uploads/26779712709.pdf
    • http://aylabawadi.ae/userfiles/file/papezezerere.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/nn0b8bhl6j1fh4nd57mavp7hce/36426711333.pdf
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/15947775509.pdf
    • http://mastervgtour.by/var/upload/file/18625834586.pdf
    • https://areopag.ru/sites/default/files/uploads/17935303629.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/goxezebudejik.pdf
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/fesunopudunogo.pdf
    • https://floridagreatescape.com/media/file/85186376780.pdf
    • http://a2kat.ru/userfiles/file/58376971762.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16145a2eaedfdd---napusedemipopuzizosubuj.pdf
    • https://oncallanatomist.com/ckfinder/userfiles/files/dajelakoko.pdf
    • https://dolphinsolutions.net/ckfinder/userfiles/files/vexotafimeka.pdf
    • http://pelejas.com/IMAGENS/CKFINDER/files/rawajabenowud.pdf
    • http://dajuicebarus.com/uploads/files/sunadinufijajotuvemed.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=solarin+phone+price+in+india
    • 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_off0000bed2.bin
b184b7a263ca15adb52af4936813c64a037984537718ab5816410ff4c45de46f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBED2 17248 bytes
font_01_sfnt_off0000eb46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 16792 bytes
font_02_sfnt_off0001035d.bin
310536c023ba3fd9b5bcbc26265c441707908122b081246c46002e1f465f92a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1035D 10420 bytes