Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4eeffae6f6c7b5f…

MALICIOUS

PDF

90.9 KB Created: 2021-06-26 12:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53ca41263288e732c72a26491620f23d SHA-1: 566fb52afb63078c2341bb05794048d976eeb720 SHA-256: e4eeffae6f6c7b5f0e72a65b13b4c26dfea814c1c30f717b756f10782a30e229
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains identified as link farms or potentially compromised CMS upload directories. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the structure and URL distribution suggest the document is designed to lure users to external sites, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://baohanhranghm.com/upload/img/files/pofafufixamimaponokufew.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/30f297628dde21df2526ced441312227/duwozatejutaba.pdf
    • http://arch-teh.com/pic/userfile/tetofexokisebu.pdf
    • http://agcslohian.com/userfiles/file/10076926878.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/60312674927.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2cdbedeaf---31660999951.pdf
    • http://alimentosldm.com/userfiles/file/96066757717.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d89d31f344d68f07d417107b64237c2e/dafime.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e155a953c2fab7c64245a2f6f1843ca/87235595604.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160afbb469c894---47725456663.pdf
    • http://hoshitorionline.com/uploads/files/97929103203.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/kepelutoluzevazixujas.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/111143218ddd00b0595860928c2f6585/jufudu.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097d2851f68d---nizopipugafenulinaze.pdf
    • https://communeouchamps.fr/userfiles/file/wosowulemizejorejodi.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d249bf46e---dexodutaxelifofu.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075709ea77a1---fepogalu.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/bdfe6f9a52ae0ea5cd890a21e0972bc4/geved.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16086981fdcbb9---85990808582.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/9aa18fc1436f604014760c124da3555c/16335455129.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/21e282d7ccfab9f3f1932d7ae84cff43/86154329733.pdf
    • https://callalilyvn.com/upload/files/serufep.pdf
    • http://come2menorca.com/images/file/92469223279.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b324a2d75e4---jogosasovideloburirew.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/uqligcdpe07qig2mb2cq9l13v3/34637899891.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=isabella+of+portugal
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 16792 bytes
font_01_sfnt_off00011621.bin
4233fa5ab7311de9972f0a31cc3dbd8be4f4fe47b61aec7dd68ae2e82256c2a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11621 18188 bytes
font_02_sfnt_off0001451a.bin
ea7418570c4daad5efc3ec0dfd479782cb636c0524a6b78b0852d8139a319cba
pdf-font-stream PDF embedded font (sfnt) at offset 0x1451A 10528 bytes