Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99a4bb3d536050c…

MALICIOUS

PDF

89.0 KB Created: 2021-09-02 15:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cbbcf1d50132d71ec4ea216100d6815c SHA-1: 35865bcda33b52c630cadd76820a09037ffd7f42 SHA-256: a99a4bb3d536050c9977340442337c54f63163616b1dd7dfcd454dd446c7f834
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of these links indicates an attempt to redirect users to potentially harmful sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611881b2ec9f3---63177019952.pdf In PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/trthbg2ukrrec58jinhoaj6qgb/dumobo.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f314f2dcfa---11237017310.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/58187736446.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/dekuxegudaxujodove.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/negoj.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/wodugiranuwazofojabi.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85876445523.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/wagoran.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedc623dc20---20318196842.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c4e1401d2---gawurutidulugozop.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/zawigefuvasopidi.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/81827146249.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/givuwolagebanas.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d6380f4a42443ab2ef12ae5a94bef0e8/55050418006.pdfIn PDF document text
    • http://vtaky.sk/media/file/koguzeragelonamerusiko.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/ragumoxojul.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff781e7fe4.pdfIn PDF document text
    • http://fitviewer.de/files/file/51493485484.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/rumobuzutamuposiwoduk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=disciplina+positiva+para+preescolares+pdfPDF 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_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 10680 bytes
SHA-256: 390df73401799282ca4e0f3878176af24c277cf5a0b35c9fc8fba8ac6ef102ab
font_02_sfnt_off00012538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12538 19284 bytes
SHA-256: 35565a583187a41354cf232410f8177993ea4611877f2f15f5686b02ac743012

Open this report in the interactive analyzer, or submit your own file for analysis.