Malicious PDF — malware analysis report

Static analysis result for SHA-256 833651214c8b2aac…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 13:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d6fc555b57bea678cf1b43f9ccce086 SHA-1: 0e6e08e441387d0e9c6af7ae0a4de5dda7c644f7 SHA-256: 833651214c8b2aacda6681846775c333f2f9a23ad40accb7be60bbf3a33192fe
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a pattern of hosting malicious links on potentially untrustworthy or compromised infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://fujiya-la.com/uploads/files/27775036433.pdf In PDF document text
    • https://gyandeepjkss.org/userfiles/file/18697899135.pdfIn PDF document text
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/2851874335.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160efd49b8c93f---90685801111.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/h0ha6k77as9bbiqenvnc3u6pn7/metosigugosomejatogewov.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b51ec9d4ca---29941117806.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/79899841537.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160769b14772f9---nekevez.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/97244677843.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef9079334---60911022553.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/954941490.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/d2432c4af2d6cb59759e2c3c33678165/65833715466.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/rexozitob.pdfIn PDF document text
    • http://cjatkinson.com/userimages/16009801606.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/gujewotuwerakuk.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/89394943236.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/nofoxejugufu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18074c2df---gijisobagirixifuw.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/rokivojujejagipa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124bccada463---papixufutuxezifipe.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/famepulilemapu.pdfIn PDF document text
    • https://cncunse.com/d/files/26757266737.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db27832e4d---tokefoxavosazunukeruxon.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/58a86407239eaa2140d6aa96a5ed49d0/jowirugamitifepibe.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7172f2d05dbe9d4c634ca5823d31625a/56774642430.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/66410881308.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844b8823a4f---21331355726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=canon+eos+800d+specs+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58A 16292 bytes
SHA-256: d355e8d2a015ada32c2b1456e78a4912fbed8811312d33483aa9c9e0dbb286bc
font_02_sfnt_off0000ff9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 17860 bytes
SHA-256: ecc7f36506a341d9a333f5ebf780b8699e2de0bc15b00e099554cfe3020a8e53
font_03_sfnt_off00011ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE7 10640 bytes
SHA-256: 0517b4ebcf91ff650980cb6667f3056c8c02970faf8c38771da4a54685e3d33d

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