Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc79e057bc9b4816…

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 12:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6b9c3b19ca3e1950f8f3190d20fad6a5 SHA-1: 570059b5fba33d85a68cd51a576f8fd816c74424 SHA-256: cc79e057bc9b4816137075eca9a9c35d233a7107cc17c939df98f0a04583cb79
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/rd30vdkfkgp7rn4g3jhah0vlak/62877047518.pdf In PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ea130dc2e5a392b4a2e51610b5c598b1/5017160286.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160803ac4dfca1---31500558305.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077be666d0d0---32781731409.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/18342005237.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/45705546114.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a6af8a349---tolomawepijipawufamegope.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/9275ae4ac0c4e6197416e80b00f6b921/86169980996.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c89e22125ed---30946064459.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/lelenazezogirapozida.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/48555376701.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c503bc62196---38358541311.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/faguweje.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/fukopuxupotokeroluzom.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/79334156760.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/91768645887.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/16686136355.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/98268587242.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/68708ab2c51ad8e3d2951dcd53d7080e/16400353372.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/43584367922.pdfIn PDF document text
    • https://chp-travel.ir/data/file/13577224245.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/2592d5f268dabfa4ba1184f6dc1a3f7f/82259966037.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/96696390084.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/55659177278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=demand+meaning+in+bengaliPDF 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_off0000c282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC282 18756 bytes
SHA-256: 8c642b8d1022a3d627c12b5286d5dc083f8c2c931222e44959bcf84f723ed4db
font_01_sfnt_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 10248 bytes
SHA-256: 5f71f5b2fcb81c0127c4fcef2f702e4da7cd5bbd80c986bf3d1bb4af53aecacd