Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d8f7decad03867…

MALICIOUS

PDF

81.8 KB Created: 2021-08-24 02:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f07b02c1e1cbff5ccd0f33eeff9a58e1 SHA-1: 6d6c217d9efe76f30cb6104e181e1312f22448a9 SHA-256: 33d8f7decad03867036cb8a48e36ee914305a3a1ad56e0e2a54a329aef64101c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links. The ML classifier strongly indicated maliciousness, and heuristics identified it as a link farm hosted on compromised WordPress sites and disposable hosting. The embedded JavaScript likely facilitates the redirection to these external URLs, which are designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9290

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=government+book+class+8 PDF link annotation
    • https://cambodiaangkorhomestay.com/userfiles/file/dekojutifudovolapuwasemax.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/punarifibesotenu.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/815394003.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/243be58629ea055c8d0708471902b109/73843778873.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/s5brkcagh5ojm4nmctv7s3kgrk/88964692526.pdfIn PDF document text
    • https://avela.md/userfiles/file/89516266666.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/34942043694.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/91345046710.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610a9a697deea---roziwuwerixuxadukurenafub.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/91107120293.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a118be671---96947289450.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085dfc2783c5---3146609870.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/zetinube.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858334d7f79---ribatimibosudoruzesukifo.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/37081844143.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/44431747703.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107779f33ec4---68951823399.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/41792433766.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/44259682308.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bb244d506---sazerojifav.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/guron.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0be7972d1c---pavara.pdfIn 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_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 17040 bytes
SHA-256: ec2a851c100d90efb06ce85b9ba02fc7b37372f671e7e1ad5a9ba90149e468b9
font_01_sfnt_off00011b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B44 10844 bytes
SHA-256: 17666f9e31a6d4aa057c8824b87c4a47a31bb914b957bcd3b2b36c2ab956f317
font_02_sfnt_off0001345d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345D 2236 bytes
SHA-256: 8ed304b738f790bc40ea4ea0d0aa1f4add5808fc0550130e6e77aace3c15958d

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