Malicious PDF — malware analysis report

Static analysis result for SHA-256 523f675b6fc60345…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 22:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f99b864f68025072e685953f8638726f SHA-1: 2a2e4e3610f5755dae6fd008fbdc3b83284719ae SHA-256: 523f675b6fc603452ae30c00239bbe6f3de3faf22f2e2ee8e32f648f14a0fa5f
172 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=dragon+ball+z+tenkaichi+tag+team+play+store+2019 PDF link annotation
    • http://luchetti.it/userfiles/files/2038281844.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/77788721288.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/25577785309.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/28319887913.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/72530974987.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/75724899349.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/niporeligi.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/zosinafufezigoru.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/42299287829.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/95167410563.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/97041585088.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614225d2a8215---6710162528.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109190253546894.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/pevutuzuwuxeriruxuxu.pdfIn PDF document text
    • http://dongphat.net/upload/files/dadowewebajesonuxuwuzejo.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/bimowewovik.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210917_DBE2E09458DFF589.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/14b7ba07e4467cbf13d8792ba5077578/34300006696.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e443f2296a283e48cd387a1828687ce2/latozifuzagono.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/koruv.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/38245877224.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/85555646965.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/67948088108.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/kjl349u9e1tidpa8pdkggi32dp/40086155791.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_off0000d463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 11688 bytes
SHA-256: ca28eeb1a447eb1775750a16daa4f0b24d6f5d904cd3b15ec85e781d1cefe6e3
font_02_sfnt_off0001080d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 18348 bytes
SHA-256: 84a3766964c57a577d6342a864659d21b7c29663b0e07b03e9f1f85d47329ffc

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