Malicious PDF — malware analysis report

Static analysis result for SHA-256 126862d4a249d361…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 13:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1986429522fc463d8068f5a0178ff0f SHA-1: 6c18343b2634a0def385fe47241f94ba27cef222 SHA-256: 126862d4a249d3613d67bce304b2d697ef46dccc17ad462562c19bda74797fd4
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=watch+online+bollywood+movies+2020+hd PDF link annotation
    • http://lsphc.com/userfiles/file///sekerokunopibebivitiw.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/duturires.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3a3bd8fdb---pobukusukinetiwarupoz.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/samotexakuzazup.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/jobetenazesifon.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/81546880142.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/soruwokezepuli.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/9e2d32e2d1a434b5a552db8dbe6bf400/tigafivubibupijix.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/xoxabozinanamoropix.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/60720954741.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/zenupoka.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/141051235639.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b98905bd---52104484055.pdfIn PDF document text
    • http://dges.in/userfiles/file/taxugufumiperavakolif.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/73500401042.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/5425055767.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/14561226164.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/49768003185.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/796112517.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/tewejatolani.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427f594ca4b---15979891971.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/fface065410c971d444f11d32b7aeab9/38944193746.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nln8flpv1993bc1q9c9iii38d7/36134147134.pdfIn PDF document text
    • 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_off0000b283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB283 11176 bytes
SHA-256: 093f8c770a448f0abd36b97f6c0aba7de857af23431a78469c1670a75c9f13df
font_01_sfnt_off0000cc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8B 17400 bytes
SHA-256: 5becaa92161d8e940adc04a5bd983df1e9f299bcb0a5cbbca2ba7b9f4625dcb2
font_02_sfnt_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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