Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbd6f3fff148561…

MALICIOUS

PDF

73.8 KB Created: 2021-05-23 20:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 659233074edcae9300a950ebe1716797 SHA-1: 6ab9d7d728fecc9130cd3834ea3ca1fd4a18980d SHA-256: fcbd6f3fff14856192a6c30acb195ab76a4d0b2421a09a8544af6b5e94b870d2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier strongly indicates maliciousness, and the PDF contains numerous links to potentially compromised websites, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a lure related to 'exercises of direct and indirect style in English PDF'. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c8ce07c6---37778306720.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/fed7861cb7fb58b9c25da6e48a9f0a6e/59027876501.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7ebe50c77---laponukovudop.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ccb3680d0---kaxawimibekaxoji.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/71140968955.pdf
    • https://acryl-bg.com/userfiles/file/55164328445.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa55cacdcb---razabodesemagavivutakikib.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/5b0b026b1bb96f705d24e309ff0048b0/68469344072.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609849c6b076c---kipetolu.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a422cd2d36ef594ca33810062e077c72/53656737988.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/gpdnsduro8c652sq4ohicpbo87/53046355278.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/bl4qkmmefugqiq5493fnegl87o/vojusot.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0bc53064---jajagopisezelavoketemu.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070e42c99031---31799584160.pdf
    • http://whatdwellswithin.com/file/20724255181.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ejercicios+de+estilo+directo+e+indirecto+en+ingles+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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe0.bin
2036c9c9b001286630942414d399bad67cdaf13004d45a70c71b2f4624287a7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 5144 bytes
font_01_sfnt_off0000f17d.bin
5c4ee0e1efb42e98e58cebc74e93f1fe78b6d5284c7c09fceedf90a666719366		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 11940 bytes

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