Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0ea5e03b67d979…

MALICIOUS

PDF

74.8 KB Created: 2021-09-01 14:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98c3fb9d9fee86360cf72bdf3561f571 SHA-1: 5bd3c469889488bce9f1f5c67ef8301e091e9c52 SHA-256: af0ea5e03b67d979b7d4cfcccb0e5686938f2b1b94b0f583afa63ac9e812406f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm, with many URLs pointing to potentially compromised WordPress sites and disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users to external sites, likely for further exploitation or phishing. No scripts were extracted, limiting the ability to determine specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://divinenine.net/userfiles/file/rilebukurirow.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0402212f36---bajudasosum.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/12675384292.pdfIn PDF document text
    • https://conberraquera.com/aym_image/files/poziwavagoluxilipazer.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd27d11d4ad7193ffe345b80017bc511/77946245595.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/xezune.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cda47b802cc---fesuvefegijagajoreziga.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d5e9cbb81---97664734074.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/28895faf72a8b0ca6589becaba260a21/63167204350.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072023a902aa---85942599537.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/76708123353.pdfIn PDF document text
    • http://iphysiology.ru/upload/96908961916.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/5972d6faaad6a2dbe366779943b1be34/96166511928.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/35488454242.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b212ed4d26---45948637213.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/5b0f1c0f7ef163768c4b0fdfb9b43612/58483380075.pdfIn PDF document text
    • http://banquat.com/userfiles/files/wareve.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/50053595106.pdfIn PDF document text
    • http://scro.ru/pic/file/39788453183.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/f47ea2ec7d5ac390e3cc091476e85793/67133930564.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/3c9cb4d910844ef54ff244521afb6d5f/pupovupitis.pdfIn PDF document text
    • https://mihalex.by/files/files/34061966883.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/88696475372.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd0365bbb7---vesawigetig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=are+potatoes+nightshade+vegetablesPDF 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_off0000c1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E2 16584 bytes
SHA-256: b722c169b622d316d5dca15d6248dc2da6ec4fb001fffd7b4bba1aefd9c6d25d
font_01_sfnt_off0000ec60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC60 10860 bytes
SHA-256: 14daff9e2df82008802a2fa4342c62416fbf5b32df759007c46759ab2b82ec03
font_02_sfnt_off000104f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1