Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d74bea397ea1746…

MALICIOUS

PDF

74.8 KB Created: 2021-09-01 15:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2e13781d266ed2f9970da2fb8e5338a0 SHA-1: 5a22603b99c0af3981bc8241d0389902296a2b69 SHA-256: 5d74bea397ea1746416565e35fb85bc6fcbf79a90693246c411f43f712ba42ad
114 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the structure and numerous external links suggest the primary purpose is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8414

Heuristics 5

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://potlista.com/file/files/24066631519.pdf In PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcda1cdecc---79308333869.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/m7l25sha88rdr2krvuncco9sau/35394493865.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/a68f7e8107cebbda3a3e25e55d70e0bc/rikizadizisomuzujesof.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/tufawewazelal.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/vupogezutexaxaxabevepus.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/fupazap.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6dbc2465c---94858841464.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609b13f820fad---nufufavewixikedonaju.pdfPDF link annotation
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/67244c048041191b07a71ba8fe60b72e/743958764.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/zetinunuremepapugo.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/fodulekul.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/10b239f2351c2eae0dc97751e1dae37b/8511861086.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/xitizonimememow.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a19209f61---45816548338.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/6660b2b6dc153795a999e30e244fbd04/31587269882.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/zajarujatowila.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/5927826655.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31a6cadf3c---zobozu.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eae284110c---fowikegubixoxuselaxosav.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fba62b9138---xiwuxerozuzigi.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/gexariviputexo.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/kaluf.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ngcgif1270glsak7tvbcqpukde/rududapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=distributed+electric+propulsionPDF 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_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1