Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52d4218ac15f91d…

MALICIOUS

PDF

133.3 KB Created: 2021-10-12 18:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8ef6fa247396388999784f55ff33f733 SHA-1: 1d93dc23b507b96ea06ed7d7343986f9ca0ff7f0 SHA-256: f52d4218ac15f91d81828caac77b88710937f3e33d1859246fe2028c44cf0caa
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to PDF files hosted on compromised WordPress sites. These links are likely intended to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3995

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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415dde76442---56298407880.pdf In PDF document text
    • https://lacgl.org/upload/editor/file/kodurigufuvitawag.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/45721886297.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/refazilowedurew.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16156f5460a144---63852757644.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16151cb4c15140---safinijuzuse.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/dadeva.pdfIn PDF document text
    • https://medius.sk/userfiles/file/pimowizanaja.pdfIn PDF document text
    • http://capital96.com/userfiles/file/19741303408.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615a979444dac---sitomipesofudenudos.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/sixalazakuxiriginuk.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/40369632494.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/10225460445.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/somubetonepugojotilo.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/kawepajetotet.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/50713760136.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/3424857968.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/bogebobejanabisamokexap.pdfIn PDF document text
    • http://mweb.cz/images/file/kufabatatatarubet.pdfIn PDF document text
    • https://nexapos.com/upload/files/doxanawo.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/94421499322.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/tatukaxexokum.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/mumefafopipizanupamik.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/lurusomegonugegokuzuj.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/4176532121.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/5bhJmFgkeCE/uplcv?utm_term=whatever+you+are+whatever+you+doPDF 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_off0001be5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D673 10296 bytes
SHA-256: 2030571ecf9bfff22260f57528d71b9f294f72a3f67a62e63492456ed7837b9a

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