Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc194b782a86af2…

MALICIOUS

PDF

52.1 KB Created: 2021-09-29 06:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9dbe873a266704b43037c68d6773a840 SHA-1: 90d0dc6e4c58dcaf5fec40469b9c338083ad0913 SHA-256: 4fc194b782a86af2ed6673d4a140c3898f96f1b39540221fd4395225e3b480e7
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it is designed to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8748

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://cityface.cz/res/file/97751396006.pdf In PDF document text
    • http://studiosantomauro.it/userfiles/files/13245211268.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210904_F251C8FCFB06B9BD.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/97042592852.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/79345873835.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/89787837399.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613af435aad53---8651130588.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/fasoraroputelupe.pdfIn PDF document text
    • http://tecksco.com/upload/files/94695714464.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/luwuve.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/20086116093.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/nuzivunorovumatedemima.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/39666031577.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/41370520014.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/79350753637.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/3jt3p1nj3uqqbga6e20bpi6e8h/buzefarijujomoludif.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/wemusigamujanitegiv.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/57238381109.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/64348930566.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/54976151504.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/45869532040.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/femirusisavuw.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/jejusuzuzopewum.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/faladejaposi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+vpn+for+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB411 10476 bytes
SHA-256: e937afc1d9be38d0df5d44b80c445432331f405e24b7708a56bae4c607a9314c

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