Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58840dbecb7f1a3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 16:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc2647fcc17a107659e07c8869db0ce0 SHA-1: a2b68c591cdd13f90110cb9ed36c6b5ee56c952a SHA-256: b58840dbecb7f1a3a9f680cf3cab2318295c0d8324ed71ba9d2a92b7d63b8100
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, designed to trick users into downloading a malicious PDF. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3ccjnao7jf88pslvmckp552hd6/zoled.pdf In PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/71613403061.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d436395c6e---mugutewire.pdfIn PDF document text
    • http://slsnn.ru/content/file/24379367945.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/72252793156.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160cfeb9e83960---50071193316.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/pufokozajof.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/fexaxulif.pdfIn PDF document text
    • http://btfa.tw/upload/files/rupijujusobos.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/darupugamijezanaxepuso.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/wagenegilinoxol.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a747a3af8c9206d38af433b7a18b4c21/nevaluwiseder.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/86202789903.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/414ce5d77a2f6c549f254ae54c6b6e61/gefumutarowe.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f64cc9d68c1---98168956718.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/24510903235.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/vokabip.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/04155bfde4b3bfd00fbba8d07a1b80c8/nuwejiluvotisupesilove.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607252e15a25f---momudatunodisapovorirexi.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/nimiliwazebomoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pdf+khutbah+idul+fitri+2017PDF 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_off0000d505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD505 18460 bytes
SHA-256: ca4500ebab399b461fda62a16f22a6479945c0f76f9052644b82af41b2f74ce2
font_01_sfnt_off000104ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CA 10604 bytes
SHA-256: b1c0862e267eefd02b242b0283d01dae613c1e708e2a0e4559026b117a12e014
font_02_sfnt_off00011d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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