Malicious PDF — malware analysis report

Static analysis result for SHA-256 035512149f00164b…

MALICIOUS

PDF

85.0 KB Created: 2021-09-11 14:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 022211e6f8e8225edc8aa1cabec2c12e SHA-1: bfdf3e50d03ca2115de01b0857296a362da7c7d9 SHA-256: 035512149f00164bb0ea302bccd97e3d4154e7f29e9fd06d2f202dc95293282d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c931712bc---47549480513.pdf In PDF document text
    • https://highrise.pl/file/tilofusuxisadojovafomumon.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161302e1377a35---32851938128.pdfIn PDF document text
    • http://alltechsro.cz/files/zebewaloveduko.pdfIn PDF document text
    • http://ergakiland.ru/files/files/26983657735.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/10322920416.pdfIn PDF document text
    • http://intertravel.hu/_user/file/nikogisosigom.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/90195404956.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/71134295045.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/walubabejazesezirap.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/fadupibezakexevurapana.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210911_342F391016938102.pdfIn PDF document text
    • http://ebus.cn/up_file/file/kolagabameretura.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/92387022117.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/batopesubotovugef.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/nixijalojuforozote.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/vulila.pdfIn PDF document text
    • http://techbis.pl/files/file/fuxafiton.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/8984470561.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/donurotoxo.pdfIn PDF document text
    • http://marymo.ru/uploads/files/66436476142.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161355b0d7c788---lefusifunebilaxuz.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/91800732865.pdfIn PDF document text
    • https://mahae.hu/files/files/63871216869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=redmi+9+unlockPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD250 23612 bytes
SHA-256: d10dcba929c31041228e9a6a8883d10f568042860ec83c5a5072007d6a3f86f5
font_01_sfnt_off00010e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2E 10408 bytes
SHA-256: 7fef6f241a698d8301c9bd0a5fc4f52f5b78b3bce956c17f80f36562d91f7087
font_02_sfnt_off000125b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC5 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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