Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b54d5844d12cdc6…

MALICIOUS

PDF

81.3 KB Created: 2021-07-07 07:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 925ea4adc4acd6c883a80870fee6a201 SHA-1: 240cf75d72a4fe549a1a1fd0e185dedf8fb78ccc SHA-256: 2b54d5844d12cdc6fa4543198fb9fd2a6875734e980de6c17047c9f5e3be6a8b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the heuristics indicate a pattern of using compromised CMS upload storage for hosting these links. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=the+general+commercial
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608186d560748---rovisef.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084ffcb3995e---pewutiriditute.pdf
    • https://loyallcanada.ca/editor_files/file/baxewewevedesubuxujufumiv.pdf
    • https://smilepaper.tw/archive/upload/files/nesuxi.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948ff529edc---zidizadiwubimeme.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160729a837f6f8---padasulujogexedidus.pdf
    • http://botosani.ro/img/uploads/file/fajekes.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d36193158cf---67227008702.pdf
    • http://kibunajcc.com/ckfinder/userfiles/files/wesukosixa.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/uh6ar92147uilbjj1ba8541ohm/xizozimubonedefuzebufur.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708180571bd---70041607312.pdf
    • http://narnivet.com/userfiles/files/fazumadugibiz.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b2f9f3aa1285d213a50beaf7bc384388/11119787762.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/zujabanefipojemubo.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/239916517f1979760d66914d87bc6e6a/segapiwixaxide.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/b31a0efe98dafc61752f49ef31e6ab1a/doluxupubekesutoti.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97813e7810---50724717393.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bfa35b23a---44630763774.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6283db2eaf---bonefotusiruduvisoz.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1db6a073d---38882836828.pdf
    • http://terezmisszio.eu/files/file/64601254798.pdf
    • http://teusz.pl/UserFiles/file/toxizage.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf08481752---99973553221.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e66521cb278655fdae626145486d9a5a/gesiwibozikakeparux.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_off0000d928.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD928 16792 bytes
font_01_sfnt_off0000f13a.bin
2dd1f0f5442c986d5cf0275ca292c723c4bb436f79eb294886357119d5b9dc6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 18340 bytes
font_02_sfnt_off000120d1.bin
c8183707ec472847fa251ea87bee7ac014feb526ddfb2bcee7ec3a4cbe1d4c62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120D1 10376 bytes

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