Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4013df289b0a8f3…

MALICIOUS

PDF

84.3 KB Created: 2021-06-26 04:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4e9d9a9d5998aacf5adcb9e1a7a1e7c7 SHA-1: 0b485854934918d8c909d20c66aa4b8513b51b2c SHA-256: f4013df289b0a8f35fa533c3b97ade3dabbf3e20575515fe5611800ac702d3d3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. This behavior is characteristic of a link farm used for SEO manipulation or to distribute malicious content. While no scripts were explicitly extracted, the ML classifier and heuristic firings strongly indicate malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/c5024427cd37d4012f0798a192e00872/94761043182.pdf In PDF document text
    • http://vivo-mebel.ru/upload/file/tovejulo.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/1rt9jntpdksg65h4f41akgdhlp/16999439997.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/ginininerisizofabeb.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/36249680096.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/9kgngshd5s9qmm7plp9540eit4/kirugimig.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c19764089c7---nupiwowesatezezuwanodol.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/56494477668.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e12b2cc607---62460502499.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2dce5d9d5---depuwofono.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/wizilojulojemivuzidedeno.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1bd29ca5b---labefukasipuk.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/34409679838.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160998d1e4219f---xenefi.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4ddd71ed2---4918590413.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/vugarimojapudag.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/77097675743.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/dabejorejofikep.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/dizofowebotaluwudigiluwo.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081cbb22aa29---mixipi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc5648b159---5560451398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=7+years+baby+frock+cutting+and+stitchingPDF 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_off0000e5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E5 16924 bytes
SHA-256: 8105fe31a0c60f369d9f7280ab44932b848d803ceabcabbfd9f635ae4a8e4543
font_01_sfnt_off00011213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11213 11108 bytes
SHA-256: 53c08d7c13f84ad915e38bc13852f73bbb33aa70ebecd5894b4bc3478f0944e3
font_02_sfnt_off00012bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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