Malicious PDF — malware analysis report

Static analysis result for SHA-256 444814c64d0eea1e…

MALICIOUS

PDF

76.2 KB Created: 2021-09-20 07:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c27779ce3c86d73c3d5a56f61cc7b842 SHA-1: 562e80c3bcb60a4b71de7ce0e0290c59d664fa4d SHA-256: 444814c64d0eea1ea1a2244505eb9d07ae7dd90701ccc39ae1129a642af38563
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5631

Heuristics 5

  • 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
  • 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=rblx+land+code+2021
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa04aed21c---96453589510.pdf
    • https://lapalettedesarts.fr/gestion/file/81318512937.pdf
    • http://peoplefoster.com/pliki/65310840517.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161412bed603c9---73595250187.pdf
    • http://margheritango.it/userfiles/file/bopewumi.pdf
    • https://strefaokazji.pl/uploaded/file/50227121042.pdf
    • http://aokunoil.com/ckfinder/userfiles/files/vumeboremerelobibe.pdf
    • http://tpokebar.com/uploads/files/posepugu.pdf
    • http://t-p-fortune.com/userfiles/file/97515150796.pdf
    • https://orangerun.re/photo/files/21395659990.pdf
    • https://ehlibeytalimleri.com/resimler/files/3851374540.pdf
    • https://mkontroll.hu/File/6765514635.pdf
    • https://valerart.com/ckfinder/userfiles/files/69978287864.pdf
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/46838888132.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/20477368390.pdf
    • http://st-johnson.com/Uploadfiles/files/25058902825.pdf
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/jizomuruwepo.pdf
    • http://bdpq.hungminhits.com/files/uploaded/files/laxudarevifenuromo.pdf
    • http://spielundlicht.de/content_provider/documents/files/3170969672.pdf
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/18422971628.pdf
    • https://uat-tunisia.com/userfiles/file/83582085145.pdf
    • https://snf.styleguides.ch/userfiles/files/nuzujidozidiporiwemi.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161312d8978ce0---peninipoma.pdf
    • http://brilliantsolarpaneling.com/userfiles/file/besakuli.pdf
    • http://1utilaje.ro/mm/file/pigote.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D2 16792 bytes
font_01_sfnt_off000109e9.bin
491331c546ae325bc726a65c894eeed0ccd939399fc5053cf8287be3739d84af
pdf-font-stream PDF embedded font (sfnt) at offset 0x109E9 10484 bytes