Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e7ac9b350efc48…

MALICIOUS

PDF

91.7 KB Created: 2021-08-12 03:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d7b123e9194f07226da0df2fee6ba08 SHA-1: ac1caf7c8d56e964bf67879f81781758405650a5 SHA-256: 48e7ac9b350efc48abcd5560b44c23477ec4de803dd734fbf210738ad0b264e9
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=possessive+pronouns+worksheet+for+grade+6 PDF link annotation
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/nafefavojabuxopitonowop.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/96433381283.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/13035526601.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/28372373463.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/runili.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/mupudomuvatixowexujuzuji.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3e984bd636c71b1aa9c156f524c28ee4/47731141356.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/c61b11a4287fb395214eda999c78ef0e/27838191538.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/mogukatiriwifimogitabepe.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/zexalaseronokilepusu.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/14657925343.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ca6488616f969e4de36bedff825fa168/57524739488.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/88910311326.pdfIn PDF document text
    • http://scro.ru/pic/file/74269587710.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4c94b6b34---57937184356.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/51479586070.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7ecc71e2c---depirabudadezinub.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/roremog.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/lixuzoxufakumagapezelaw.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/402c262090e1048658879682e4101bc1/xeratuga.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/4094702115.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/49421199947.pdfIn PDF document text
    • http://theponghop.com/upload/files/gesirekisufudavomalujir.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/fapesibakapetojofamu.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/8543ed7e4eb8787ec23f1ed0225b64d2/6105713474.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a622ce0c967---87513916016.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba3beb9d79---74733068650.pdfIn PDF document text
    • 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_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A7 11244 bytes
SHA-256: 9198cc3757f5353c93421676bcfeedcacff53c0d543ddbff97e904650d01d311
font_02_sfnt_off00012fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE7 17560 bytes
SHA-256: 1adf26b18ef8aadab8504ba92cbc216e3fe869b974d89dbd824a7af9e758c245

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