Malicious PDF — malware analysis report

Static analysis result for SHA-256 8760f4eb9f8d003c…

MALICIOUS

PDF

81.0 KB Created: 2021-08-16 12:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff09f82cb66762386e206ac899bbad17 SHA-1: 5bb1a1a312fc37a66e02716547ab8b02bc94aa70 SHA-256: 8760f4eb9f8d003c1fb857cbf531864343771da4b94e7f371805cbe1813d729f
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=kalnirnay+hindu+calendar+2020+pdf PDF link annotation
    • http://statsale.com/data/upload/ck/files/tivekabanurek.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/b0c632a64ea652e2001db72d4c348b9c/xasoka.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/vuwanukedugateforelaleked.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/gnjfd7otv8av5qutc7b93h5a16/giwafupesadi.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/votesej.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6dda513b204cf27a0c4d1f5aa4e39010/88186306507.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/a43mqko6n6g0s334cn7c57vek6/11033277297.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbbf63a6f---88343404796.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/66923556537.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/20027382011.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/46870557708.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad833740b0b---35018307988.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607043e326381---26607666851.pdfIn PDF document text
    • https://actorconseil.com/files/file/880259696.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/zozurixosuve.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/75242655089.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/rofeniporafe.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/perikig.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/lasamadop.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/34vj6nli1eibgsd1sags4iprh0/xijeropufiwisod.pdfIn PDF document text
    • https://media-get.com/userfiles/files/wagalovosix.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/98117652567.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_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 17956 bytes
SHA-256: 3d7b2dfd039fe854c8a5dea08b2730c7c78cffef1a40234750776b03b0fa6199
font_01_sfnt_off00010633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 10780 bytes
SHA-256: 22cc838afa5b06ff6a3f36b0922cc1a40b0204f18afc627d2ca0273cae83d88a
font_02_sfnt_off00011ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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