Malicious PDF — malware analysis report

Static analysis result for SHA-256 545c780e1d4e2a4e…

MALICIOUS

PDF

81.2 KB Created: 2021-07-03 03:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 170606233545562299ea9c0ff0bc5e65 SHA-1: efe7c2d91bf063565c2fd4d6b50ea18d9dec3bbd SHA-256: 545c780e1d4e2a4e92918670250e767b8ad9c65a5b0e3a988835a500b6481a7d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which point to compromised WordPress sites and disposable domains. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to manipulate search engine rankings or redirect users to malicious sites. No scripts were extracted, but the document's primary function appears to be acting as a lure to external, potentially harmful, resources.

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://catamma.ru/uplcv?utm_term=what+is+fashion+forecasting PDF link annotation
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608b16724f125---kejuzepujagixobo.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/5b0mqbt1ah0i7pqbr0g9rhm313/sanovamamakenonanuzeboti.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75531741112.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8ov92ofj3udr1k4clujho20qls/36106968828.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/vofijifox.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/xemuzujazoginepusi.pdfIn PDF document text
    • http://toyotalongbien.org/data/dulieu/files/86617943116.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8f40f653953d9887bcd8c7ba68681d4c/zumoda.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78c23ee3e0---zibupaxiwodebugu.pdfIn PDF document text
    • http://garderoba.sk/images/_file/limanijefipedimolija.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/zagamakagiban.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608413d5ef076---govur.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/12168886937.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/220433b0a66c6037a54d2865d7c946c6/37934766854.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/d79d31a7a77e962d4708e7cd945f8087/37412906157.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/tomenimadeliwuzirela.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0ca8f06b---21715629404.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b2a06aec2f32bd8a363330405c57a42e/dopuvedukujajuligopidel.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/zorijuz.pdfIn PDF document text
    • https://tonitomov.com/picture/file/worax.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/vibulosufog.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_off0000da39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 17532 bytes
SHA-256: 0925c901dad2252504d370bb2ba0316ead773aea5a5b9ade657a4a6d967587f7
font_02_sfnt_off00011fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE2 10560 bytes
SHA-256: 8422165314ae9fefb67780cb6c88ad95f401bc75525d906754fa76fa912324f9

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