Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc48888a4d3e7f72…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 15:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c7270238a699d6dc880230cbfe926c90 SHA-1: 0d4bb0285a700e064ed1ad198c67fefc63551495 SHA-256: dc48888a4d3e7f724c6bdaddfa854bf4fefec4f0b682d9e3d7be7c5875d0549b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The presence of multiple links to compromised CMS uploads suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://entone.es/wp-content/plugins/super-forms/uploads/php/files/5b236ec0675216dab9fa5fccaa9ec607/dadelesakuxisuregasal.pdf In PDF document text
    • https://toscanafantastica.com/userfiles/file/58443532224.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/22707647360.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/ioacopdqnflpfrnca2dlsciqh4fu5sts/86004027187.pdfIn PDF document text
    • http://acril.ru/ufiles/files/48576388838.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/nunom.pdfIn PDF document text
    • http://medi-sen.com/files/files/87878868792.pdfIn PDF document text
    • https://campermagazine.tv/public/file/zuguzufufigabanewibe.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/48914359106.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/68599800073.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161391d732909d---75868295512.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/a687ul0hv4d7ohs3t9h1bfksnk/21767519495.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/15126035574.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137459df3e39---56616122280.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/xowap.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/poxojorepekuz.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/284145402.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/mosoberurimipagevolan.pdfIn PDF document text
    • http://fourfoods.com/images/files/rudezomexev.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/6612fb61aebf17ef68fb8775edd15ab4/15643356921.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/xebosirekesipikosenifife.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/80413117783.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4830a7bac---nijimukiwakaxi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327defeecd3---16474447484.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/luvidoxuvanudebijuku.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/gajitenokut.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/rukoxojelusexigoxelanej.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/23690003156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+games+you+can+play+with+xbox+controllerPDF 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_off0000d208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD208 16868 bytes
SHA-256: 6393240db41b66814fe5f9c551e82c3a2b5175f9cb286b3cca7c8ba582658b2b
font_01_sfnt_off0000fd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 11484 bytes
SHA-256: 20c266e8be9a01ccd88aafb664ef1dd789f18c438dac4d04586c3b41b278b16b
font_02_sfnt_off000117e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1