Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3213fdc3c34683…

MALICIOUS

PDF

91.6 KB Created: 2021-08-12 12:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f0b22c1e58cae7592750be0bcec2025 SHA-1: 65fe8e36b91c7af9caff2e9587d4b1c8dc220563 SHA-256: 3f3213fdc3c34683ccc5962ebde0717bf7fb6a9ce8b3c8926a1d7de2bda8374b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. The file's structure and numerous external links suggest it functions as a link farm for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://kolasinprevoz.rs/slike/files/60689201142.pdf In PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c556d55ab---94367052881.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d361e2cca9---18595716074.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/bunix.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/lofibitijigokove.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/regomeled.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/54861291945.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/24782929144.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/golageropajomijer.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb67b2ed0a---93143106674.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160760eacd833f---9900733135.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/20755396172.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/611108d729b2bfa2e412e97eb9ec2a35/71101474215.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3d8375442---fesejisejekevu.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/dunixotukasazubisabubu.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/40563562112.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/50153823155.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/60017682093.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091ede0b7b7f---xukabejedegavigesapijid.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/b15r9hp73jevc2a76l7lcmuiu5/43896000377.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/xonadavulufubutigezinofaf.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/32651717933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cod+ghost+cheatsPDF 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_off00010396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 10340 bytes
SHA-256: 6bd08e0e5c2f1f654435f8b7a0a0c19bd45f999eea10f4b54b60cda91b1b9cc4
font_01_sfnt_off00011ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE9 18380 bytes
SHA-256: cb4467e38190b2ba4db797fb8438a87b0d753c7e19778b613c6fef60066eb8f5
font_02_sfnt_off00014917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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