Malicious PDF — malware analysis report

Static analysis result for SHA-256 6795e9e56ebab93d…

MALICIOUS

PDF

70.3 KB Created: 2021-09-02 10:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a36d37a048a0c81d6c7fdf003c973e20 SHA-1: 9512ccf16db420fe938b5eb95cc8487ed673a8cb SHA-256: 6795e9e56ebab93dfea09c534a53c5be3afa5e1ffa44ac37c180797563814d4f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to trick users into visiting these sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7696

Heuristics 5

  • 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
  • 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://silverk.ru/img/lib/file/xufefoxizuwebemiguwupeji.pdf In PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/91795492005.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/tiril.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/dabifubegurulabe.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/zojiroso.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/qpbt921qm4pt9javl0ti8csbe5/jakegovuwa.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/56pn77m6ujofulaj89oenvsfin/40462517128.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acf113d6977---6738128836.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/7932035110.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd7881f54e---43027489721.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/todapixoneduno.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/vabelada.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/96048665217.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2e3db336c7f1d409908b9e2be7972843/53184129339.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/7110820107.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/774f3403411bd010eecd6a6cf706b2d1/62118896732.pdfIn PDF document text
    • http://philboyd.com/kujenutakulagenedod.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55b6b90ab---kukizuxurojilebuvi.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/cv3akc13f679ephdj3n2rg329g/gibukurogeja.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805b4c23613---26671475008.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/gilufikiberegiw.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/zumuvugonava.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abb7f3e360c---90642263564.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c24ddc1153e---gafijedovisomegurovurezol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=commerce+textbook+for+senior+secondary+school+pdfPDF 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_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 16972 bytes
SHA-256: 044f632f65d7b3e2fbec5c64d28315b4a4d1733be29f79eab2f6db92aeb5b1f5