Malicious PDF — malware analysis report

Static analysis result for SHA-256 4514707f86cdecf4…

MALICIOUS

PDF

77.8 KB Created: 2021-09-13 09:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4bd10cd734f9d6bab1b5b2fb52c8f272 SHA-1: e2e08e112fcfdedfddf3114d959af1da2276a4f2 SHA-256: 4514707f86cdecf47a8be25745949a05505b97fdc7dd5eae9d31f2a01c45905a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous 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 external URI heuristics and link farm indicators supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ruxthai.com/ckfinder/userfiles/files/borirorejutasodegolux.pdf In PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/96893980434.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/44768099311.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/jelitesewelasitidisujez.pdfIn PDF document text
    • http://dalaichau.com/files/60092257957.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/nomizitunovomufolu.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/depubawupatetaputugomu.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/zenakutujose.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/pixole.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/95960646757.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/jamipowiturusumeriw.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbdf593102---86538962883.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/lonir.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161350a95b82d2---38513178258.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/38930378644.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/mawojeravuxev.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/werebebitubijakewagesuk.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/75700717209.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/36206806736.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5so5um2kilavtsjn9sf4cdvt41/12540037129.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/44513646549.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/korusa.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/titizixutunomamufuke.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee8ccc7e96---35492962111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=kung+fu+fighting+game+tekken+3+download+apkPDF 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_off0000c479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC479 18824 bytes
SHA-256: 2ee324a18d884be2443e4cc44d86765942e63fe0a5942ffce06238412201e26e
font_01_sfnt_off0000f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 11120 bytes
SHA-256: 7ee4d3d7134160b6fd9a900379d37563af7210021b66d08fe3c907c0d59af1cf
font_02_sfnt_off00010f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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