Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3962cc228b14cf…

MALICIOUS

PDF

82.1 KB Created: 2021-08-09 08:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c897db2a0db8fce9b26fdb6236c531b SHA-1: f36dd29305cba9505b0f10ec19e51e79be381ab5 SHA-256: 5a3962cc228b14cfe6cf37ed480017c53d75f8f0c0cdf8325727616c7428aaec
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage and utilize link farms, suggesting an attempt to disguise malicious downloads. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of external URIs and the 'compromised CMS upload link farm' heuristic indicate a likely download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=vishnu+sahasranamam+kannada+lyrics+pdf+download PDF link annotation
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e1564942d---pilutapokobetasasilagiwib.pdfIn PDF document text
    • http://zae.me/datafiles/file/12887365290.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/61180294135.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/1769466605.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/denofofisir.pdfIn PDF document text
    • http://cke.hk/userfiles/xovimuda.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/6e4b57109c6c53b9a60bf681aee1ddff/dapalarafono.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/didesuxarebuzolexoramoga.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/95823107083.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/55562845549.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/186824775.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/64972950252.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/xibife.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcc98c4814---katijinowafubidolediv.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/78aacb1d2cfa83315789d454084ad607/zipikamalejumejame.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d458ca6a4---lagof.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/1400832474.pdfIn PDF document text
    • http://uco-kampen.com/media/files/57188122615.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/gubaxi.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae49e3030f---78087605554.pdfIn PDF document text
    • https://cecprint.com/images/file/53231067207.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ri5m9uuqclt4gv41t16oiqrmss/tazugiremeperi.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_off0000d825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD825 11016 bytes
SHA-256: 61077aa495046c303ac48cfbb455f38693eb554c14dde4d209303b1777674765
font_01_sfnt_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 17920 bytes
SHA-256: 58ab3db91a88b77cd71b2985159b40abbd593b2b257f4cf28e6c9fcfd5372ff6
font_02_sfnt_off0001211a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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