Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdc6bdee117237c…

MALICIOUS

PDF

69.5 KB Created: 2021-09-16 19:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c2763dde27632f9b4c582c4c433ffd8b SHA-1: 437fd94e91d98b65b2c02009156f2c171534c7ad SHA-256: 0cdc6bdee117237c0294a33827b19505e1645675ed8d65a187a685af7e653cd6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links and the overall detection by security tools indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=1v1+basketball+unblocked+games+77 PDF link annotation
    • http://at2apigroup3.com/contents/files/28375560897.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/suvusopelesupabofofu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614130bba2718---58699731575.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/38419099088.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/2555252122.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/79260823858.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/maralagimaxewovulijefi.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/002155883445935756b71fe4420c75d7/65879097479.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/71331377924.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/12050079687.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/lojunepelekutirenoxar.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/968175d8a945661d791dd35b17ce6edb.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135af8f48f1c---lodunorumepamirenumebesi.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/gironamigif.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612fddedac2f5---52051287481.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210911134740.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/zofikeniwel.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/xegesorinivoj.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/82016709476.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210912040856.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09f34a2d2---75660311382.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/fuvidewuvanegokawimataxif.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/40134055988.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_off0000b25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA71 14752 bytes
SHA-256: 894e4cdb076492748f163d5a05a317f9d4317de441112432686216b40cc5bd9e
font_02_sfnt_off0000ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 10924 bytes
SHA-256: 60e1fa5c1cc195abdfc440fd6df78c1b65efdb7d20a9ac80b4d8344201f055a9

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