Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce71e8ffd8d4999…

MALICIOUS

PDF

116.1 KB Created: 2021-07-01 14:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8c66e9894a5ad500e90b94e18c346fd5 SHA-1: 4a3a3f122f5f401651432bf8c73bc4e334613839 SHA-256: 3ce71e8ffd8d4999ac2b7e341ff1d5319a46a837c53fc7adc0c374f6419b7e33
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely lead to phishing pages or further malware downloads, serving as a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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 https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/48db2f673102621f9a5cf9366b703c33/41109694021.pdf In PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/eea722a2867dc98105dddd201780471f/79974397463.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/bevojicd44c3d3ito6vfmeh1s1/navat.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9d758491e---33824074499.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d46ad48cbd5d16bac4736105a01670e6/45007310526.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ace50de13---71955785207.pdfIn PDF document text
    • http://jonmechina.com/ckupload/files/93550942005.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/tizagujix.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/90447bc423ec677b6719a62ef8bcdd25/wisaluzozom.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/lopunij.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5af587dddf---14380743338.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/3bm2f8phmea7j2c6a0euf82ir3/32908950802.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a98b1040d87f6f09a6b69d36adcc007b/ruxezamuninixisonazad.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/nakile.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e03c5228f---95875311298.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/f77glhl2k8euud9isvrqfal7a0/nonotifuramo.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ch6igtu5kaqg96nfjha6mgl4kq/nuxomul.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///34793637318.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce5493880d---fokazusopesurufulo.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/susitiwenureberebelezimon.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/77f5bbad137e85843ef040b15bf13b16/17652760357.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/54721127072.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c941e29ed1---88775396834.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d2067d98caac56b48d7b6eaef45393c9/sawikukejuvijukezuxo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/6f35ebb2dc36b6506c705fa6c41caeed/27396684779.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/manalixufileb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=numerical+methods+with+matlab+recktenwald+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_off0000f884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 17308 bytes
SHA-256: aa9ce3d934114bd23890b49df0c535941a187bed5707f83c5ad4a42cef4ca0e4
font_01_sfnt_off00012593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA1 40176 bytes
SHA-256: 9bcb9a1c08c959cc44ac87f59bf10b692acd3af42ef18d365965387e7e6efae9
font_03_sfnt_off0001a7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7D0 11280 bytes
SHA-256: 8b8c4dabb5593a0c1d2e802f4fe72a52f77618c27f2646ca92be072ed8d80922

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