Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa96c0ebbbde6f6…

MALICIOUS

PDF

63.8 KB Created: 2021-09-20 12:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8bd909906c6e197b4bc2693e43ed21cc SHA-1: b3ead6515cecad58e221c2edc968778d09f4a3ba SHA-256: cfa96c0ebbbde6f6c0aad2318c88e60d415f88da714c1a47af1d0ed35c06ba6a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage and other domains, suggesting an attempt to distribute malicious content or redirect users. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5661

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://takarasushimn.com/userfiles/files/lumepewadaguzep.pdf In PDF document text
    • https://abss.pt/userfiles/file/59396953037.pdfIn PDF document text
    • https://adikketiga.com/contents/files/7246192587.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/jodejewagorovu.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/lonosoz.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613143d7239df---ropuginuxufatitobegufaj.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/20991435203.pdfIn PDF document text
    • http://kme-kme.cz/files/file/tewolasejom.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/1417149764.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/17530054656.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/77319494979.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161484c8d8c8a2---38437436806.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/46542569895.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/garum.pdfIn PDF document text
    • https://binhvi.com/upload/files/rinitusefojigesadojol.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/ratuzopes.pdfIn PDF document text
    • http://zenithmetals.com/files/23166586313.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/jofiladumipixedu.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143e0d677aab---tesumovekuturigavo.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/81559477313.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/48208312971.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/nilazukakiwogewew.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/97346945229.pdfIn PDF document text
    • http://digifast.cz/userfiles/76153297105.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/miregonijiwurebumaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+terminal+part+of+the+stomach+that+opens+into+the+duodenum+is+thePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65F 10948 bytes
SHA-256: f836340dd5569b522d6503c8aba9571d15eccf74d95ad2ee4d7068b86f8a32ce
font_01_sfnt_off0000cf89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.