Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99cbf5c173b72ae…

MALICIOUS

PDF

88.8 KB Created: 2021-08-14 09:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db6fd34a9e9b009702ca3e3cb069deaa SHA-1: eca5db33614ebc2af2810feb04cc85aca9ca9b41 SHA-256: a99cbf5c173b72ae95af737289180826ffd2fce9e09b9acb5f62ecf41bb98008
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and link farm nature align with techniques used to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • 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
  • 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://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b59f8a08655---37363289420.pdf In PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/serirepira.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/18dc6a6b53dbebc04e3a6f30fbe358da/10259783264.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/78127101749.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eadc125aa---23714717944.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/761188baec2cfeefa0d42b9fe71b117a/limizoxirixokibibovojumep.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa71f75932f---26297325500.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/veremuvujekitifodezulusi.pdfIn PDF document text
    • https://vpmemorial.net/images/file/gomixifeguferisama.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e57775117---67910924032.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/taaiu280bok6c6c88m2nkg28kv/vesimovozebojuke.pdfIn PDF document text
    • http://coffee33.ru/archive/file/zezijubaxebawifo.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/sipekugufule.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a829aa2e8bb---talomakezadifapifetikuxef.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/28184847781.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/14b16386d2ba485177001b9902b6367c/mesizifuwarudig.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/mumevejirenerezano.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/q5de11c0p63ufl05qf9e191tf1/51502261783.pdfIn PDF document text
    • http://henca.com/files/details/file/lunidagewomuzonolujitore.pdfIn PDF document text
    • http://tonystelly.com/clients/873487/File/fuwogukazi.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dljtn8o78u7rkrimbo09tgmemj/dogovupekabefutomalekatoz.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/65564012012.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/54356407352.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/83788914153.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d680e55449---sivuzefigisutol.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610b15c0e6505---sowimosawa.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/8ih6vmoggtkn4bsvn2a7p24eka/miduvapiwesurikef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=que+es+corporacion+multinacionalPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001111e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111E 10696 bytes
SHA-256: 9038718e7baa30ff2d0da9af3b0dd4213c3c113ef8f23bf110481c3eccbac4b1
font_02_sfnt_off000129ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BA 16956 bytes
SHA-256: fc51d0766c5eb45e71c00296d492b7f14446bc4b014e55a020f037d114bbde22

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