Malicious PDF — malware analysis report

Static analysis result for SHA-256 860ade27309e17a5…

MALICIOUS

PDF

83.4 KB Created: 2021-07-02 02:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1981b2f3754aac41e07db0d90aeb57e8 SHA-1: 53c089d7efe20e30aebc8a0b483a28a133407c4d SHA-256: 860ade27309e17a56a4855978ad19675ea86f6e62664d525755b60b0601166cf
96 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised websites, many of which are hosted on disposable domains or utilize vulnerable CMS plugins. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to malicious content via indirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://imhyuk.com/imhyukeditor/userfile/file/72443818098.pdf
    • https://people11people.com/uploads/File/nibuk.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/d3e93edaadabb7ec92348bfe1d81bf6a/tobigedipadixexedawemek.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2c99d3b010769c3318634b84b9b9d59a/dolevugasedenazatalajado.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/78852206203841340f3449290fc2bbd9/dabunotaboxorowuwu.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab18e9b5528---24016405533.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2570e2f3c---61297222998.pdf
    • https://aimhc.com/userfiles/file/bobefejovixukigas.pdf
    • https://nangluongvada.com/uploads/files/migesorevuravorefibepu.pdf
    • http://rlangkhan.com/upload/userfiles/files/sarajupoduderudirobobefe.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/u3govemmj7fumeut9r12q5esr4/vikosapegovusozuk.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607045a9cf5c4---78632497913.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/55ebc99b602c26af79810892a5f8d882/kezisutopiwux.pdf
    • http://automotiveenergy.cz/userfiles/file/nowipirama.pdf
    • http://technestudio.eu/userfiles/files/3624970745.pdf
    • http://timandlor.com/userfiles/file/memafomosuditetu.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/de082411f82ad9b5033462385f5672db/98132218060.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa365cec755---36606033926.pdf
    • https://auto-rujo.com/images-editor/file/dosajebavata.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=3+components+of+a+thesis+statement
    • 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_off0000e283.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE283 16792 bytes
font_01_sfnt_off0000fa95.bin
71e4d3089b1d5df830423c5a8f1629fea335b69e9ce706b93b6b035bd2e896ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 16968 bytes
font_02_sfnt_off000126c7.bin
3f1c30eb8d845575028b9c9319ccb7137b142ee031fafb9d553bafccdd2e4c6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126C7 10672 bytes

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