Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52797be6ad2d5d1…

MALICIOUS

PDF

95.1 KB Created: 2021-07-21 14:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d0de3491819919b5c13a868c09cec97d SHA-1: 87fc8d3dff6ccc928b8a1978a71fc66033cef27d SHA-256: c52797be6ad2d5d13ef7334ae5841e52b7e96b0663425a8577dd43fbd6999cb2
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. The file's structure and link farm nature suggest it's designed to exploit search engine optimization or distribute malware through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c136bc436---kegopexagadovedu.pdf In PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160f0277e2a7df---7226134522.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/latif.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/87671739644.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c708b9b6005---jatelasozuzavag.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/38d582d62806b8234b0a92250bbcc607/64436067771.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/7371c35f874fa4c8f56c3dabd3a235bb/67056472724.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/gaxala.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/8b65b3ab87cead8fdb9ff769f0d15ab4/kurijisoritepopes.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/jazelomulojinejor.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/3198227663.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baefeaeb58f---jetulijakolatunuzikibaso.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a6d0e754---32678311451.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/73542231528.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/sefovukovudewutirig.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160f77de9b01bc---44773266731.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/86bf9f48fdc9b61b1cb09382ce42ab88/lexogizugegumalu.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/62028290417.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/geberovafigiwatowomape.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/fafevobox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=an+introduction+to+stata+programming+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_off00010e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6C 10864 bytes
SHA-256: 9411677faf552c3d39288be6fbec88f9d74bf1c4f5bc1a12a21b2ce185cd4478
font_01_sfnt_off00012755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12755 17616 bytes
SHA-256: cb6267f3f432478f7bc70352f4730472b34ee4e3c8b09d3dea7b57b8b46eeb6e
font_02_sfnt_off0001558d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1558D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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