Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8244cfd4411199…

MALICIOUS

PDF

108.0 KB Created: 2021-09-04 10:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: baf188f3ed808757ea676fb2ab9f3ab8 SHA-1: 186ded6dcca445516142044fb0f4e210fb6ae648 SHA-256: 1f8244cfd44111994c712ec37bdc5bb66047f1a8dda6467a24795216011cf493
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or phish for credentials. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://drafthe.ru/uplcv?utm_term=ainsley+rodriguez+pdf
    • http://al-farh-iq.com/upload/userfiles/file/fovosote.pdf
    • http://hitecds.com/userfiles/file/bitipupiwurami.pdf
    • http://anvlaw.com/userfiles/file/35523582430.pdf
    • http://mariopresto.pl/userfiles/file/tixizoxorelemoj.pdf
    • http://cuakeobinhduong.com/upload/files/lejareliwuxunafiruw.pdf
    • http://augustaelectricalwork.com/editorData/file/nivokibaxome.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e82e8b8552---73545624260.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/9fb98d9586c67d814b79809be7e956f9/lexebilopodof.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a591373ce20---70706411549.pdf
    • http://faizleathergloves.com/userfiles/files/75836992367.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/876660eccae69a2d675f4e8b6694677f/pamolikogefuf.pdf
    • https://chiataiec.com/userfiles/Proj_Name//files/9192764810.pdf
    • http://studiodebiaggi.eu/userfiles/files/32184626042.pdf
    • http://siciny.pl/userfiles/file/muxifujikijatuzelivela.pdf
    • http://jirehenl.com/userfiles/file/300143098032.pdf
    • https://lockerova.eu/admin/upload/documents/mezemumegetesorolefuwef.pdf
    • https://dukeofmarshall.com/ckfinder/userfiles/files/tafawumoviwilulijomidujix.pdf
    • http://olddieselparts.com/ckfinder/userfiles/files/gapamegetesumutepafixo.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610d747a2ad0c---terugit.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e48761957---95273690541.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/pq4kid70qqlc340ktlqephmt43/82086921565.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/082fd03432efd92defe6167c61056004/8745548888.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f93c10ee647---gibetipukof.pdf
    • 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_off00013a67.bin
00635c0871dccb0eeecf5f8ee09ebb393cb8cfb5e5e53522bb2debad8989640f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A67 10668 bytes
font_01_sfnt_off000152c2.bin
4f083bf668a2d9e49f85b1c313530b5b37252a493a52f8f445e3ec6dfbe30b64
pdf-font-stream PDF embedded font (sfnt) at offset 0x152C2 20796 bytes
font_02_sfnt_off000189d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x189D0 16792 bytes