Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6e857d84c33a08…

MALICIOUS

PDF

77.1 KB Created: 2021-09-27 21:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 401734099502021018cb8d5b8221d265 SHA-1: e16722400d8dce626a1191ce7a6b2d69b34b5795 SHA-256: ca6e857d84c33a08e58aadcbeeda614779bbc4417f8f55b6b195715eb4f2c19a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://onlinevay.com/upload/files/vavorurasagexufoka.pdf In PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146380460b3e---pobanagozunagejosinu.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/85707950995.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d226f34d9---jerowopubimuwareneruma.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/37341367196.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/worujomogowuzawuwibufuvat.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/56606678095.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/90082639797.pdfIn PDF document text
    • https://proia.bg/userfiles/file/82172583789.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c49af9991c---21109366204.pdfIn PDF document text
    • http://ndt-ultratech.com/files/41004890523.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/21570433726.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/vukipowanadunorojixo.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/56489720929.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/42081915639.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/vavulixulonobufo.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3449c4aa9---lipadowubovasubokaropu.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f73229dad---pijutuxade.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/zulukidejufavosakimode.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/49652797515.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/20803356617.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/6802756875.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/25341334350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=convert+kindle+fire+hd+10+to+android+tabletPDF 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_off0000c1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 20012 bytes
SHA-256: 0e99d3af4ef2a89a9af6b3e1d04d0a8f888d51d46ecb81b2ecd09737fa6ca248
font_02_sfnt_off00010e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E24 10784 bytes
SHA-256: 8a4777a574a493af62a55d9a7c504226971543e2051a9cca5cbcbc4b2b7c1b47

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