Malicious PDF — malware analysis report

Static analysis result for SHA-256 20846521b249169c…

MALICIOUS

PDF

95.8 KB Created: 2021-07-28 11:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4d511779efffb6125245563e8a9d401a SHA-1: 2304a15288482d9a33d8ad5c294dcebee5ebb28c SHA-256: 20846521b249169cab048b2da311b89d052c193f74923771d6b7f82b7ee89b60
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised CMS upload storage, indicating a link farm designed to obscure the ultimate destination. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of these link farms suggests an attempt to lure users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb38bd4d3f---20715535389.pdf In PDF document text
    • http://drivingschool-brno.eu/files/22204716362.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/895c9f31e82342e4d7725b632a2cd761/puwapa.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/nuxedumasofivaxowijina.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/34005147334.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/48264029900.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50205a23c2---64159918314.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079d7b5f1739---goxarilolimul.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/31478011938.pdfIn PDF document text
    • http://jfe.hk/userfiles/suzonoxelujisasiwifela.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/387a673443592f457a736c5dee2808ca/vaxisivapokip.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/090019538175.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c887a1cf960---tomujinejuwefivunule.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160850899307a9---zibumejuliwodirivos.pdfIn PDF document text
    • http://seamacros.com/upload/file/lumazitiponabetuzi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4f4713b55749d3b4d9b820aff78656b5/77437622976.pdfIn PDF document text
    • http://abc-tel.ru/data/File/zokiwo.pdfIn PDF document text
    • http://halaljones.com/uploads/files/nadalesevitux.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/33909333207.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/nutulovolopadugus.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607645812e1e3---55934550203.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/14e3e73029041228701b7500864e01e4/33066392642.pdfIn PDF document text
    • http://regmac.net/userfiles/files/79081667966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+free+will+vs+determinismPDF 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_off00011571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11571 10644 bytes
SHA-256: 91dca7371144d2e04eb8f37dd4e9d1b5b23b3d7f78c11c3fa4af87dafc564689
font_01_sfnt_off00012da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA0 16900 bytes
SHA-256: 27a1c2a9d458bdb70b0194e9a25fca6a4a8f352baf0b29202d66fedf3690fda8
font_02_sfnt_off000159c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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