Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c86034ac3af78d…

MALICIOUS

PDF

73.1 KB Created: 2021-09-01 03:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1801d9987e962c11231c62de852e2e21 SHA-1: 9c291dea6c125f715009246f07058f413da8be9d SHA-256: c3c86034ac3af78da61c6242f78bb7c2c4a3f9883f0059f2d2a5bf9580015574
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, designed to trick users into downloading further malicious content. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic suggests an attempt to distribute malware or phishing content. No scripts were extracted, but the document's structure and URL patterns are indicative of a malware distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cleangroupbd.com/ck/upload/files/fatiborajod.pdf In PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/bakuzafoxejewev.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117f431c9fa2---13086148675.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d7ce9e02c---56987243467.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/jajenawabolisiwawojaroriz.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/505413306d61705673cdbc5103896b13/15856877140.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///dirosapafanexij.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a4ec689140b2ef45ed7ec045a848f67c/9985612177.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/popagumonizibipamivewe.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c952b1032---niridiporavepitenasifaw.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1181e01c04---xobozif.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/joviwusewatogelipev.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/5543006321.pdfIn PDF document text
    • http://premium-t.info/files/files/dibefevupulagomovitu.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16102b2b66b276---tejaxuzofo.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8cd8da8d0ca661672c009ae0b4dad89d/9943545965.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/16ak495d783ab9ta9mdiol29u0/xekirosixelofo.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/52cce9180df81bf4b0a11187ea4abff8/31068693897.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1612997274bcba---fukus.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/62477099667.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/bodufakoxuxebusumodo.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9e843d03---bivajamapoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=budget+and+budgetary+control+pdf+downloadPDF 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_off0000bb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39A 11028 bytes
SHA-256: ebb3384a4b0552bba2dcf7a34ccda93d0db21c4cf11497e0f60fff4c9b280895
font_02_sfnt_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 16144 bytes
SHA-256: 6f0ab383a6878e1652f118f30c60adb61ae90d6c14e3b78d7557badbf6849702