Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f4724c8fb56d44…

MALICIOUS

PDF

63.9 KB Created: 2021-10-13 00:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f87002453cb91087ab402952c9be9f08 SHA-1: 5cbe7633cc2ce432c18bac0dcfa6d51b982c0f04 SHA-256: 72f4724c8fb56d44c9cf9c374170f7588ee3f8f22d35824b1f335a1b4da49d7c
94 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files, many hosted on potentially compromised CMS uploads. The ML classifier also flagged this PDF as malicious. The presence of multiple external links and the nature of the hosting suggest an attempt to distribute further malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6298

Heuristics 4

  • 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://cannamelis.com/userfiles/file/suvunijuf.pdf In PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/xerunokopimo.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/97421021371.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/feruwaroziduwexar.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/69728328811.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20211010135540.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/20262451931.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/desebuvaporide.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/q2t6c8268urem4g7djv87l90h7/lawozojisutivuzowe.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16155daff7614a---sakidokojoguzavezogijak.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/luguvosipupono.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b50d5ef67ba090661284022e124c205/31358969885.pdfIn PDF document text
    • http://pasquarelloplumbing.com/UserFiles/file/xijedaveropiti.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/wedejuniwasoji.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/99007591630.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/91323155901.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/67584776165.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/aa2784d944746e8c2d6c20b44db7ac1b/regawofafupumifev.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/49588197303.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/poxenagelafuxulenajan.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/sowudokufip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RhDyTiV0TgQ/uplcv?utm_term=how+many+oz+in+30mlPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/86294570703.pdfIn PDF document text
    • 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_off0000b852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD064 17648 bytes
SHA-256: 8e30a949e00b810b1f7c57b5a8ec9f02bab5473d53132684d9862037907bd5e8

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