Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d69329499241876…

MALICIOUS

PDF

88.0 KB Created: 2021-07-06 21:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e69cfb21c7977509ca66e76f261cd972 SHA-1: 81194ed8ce3069d915711afc668cee318f726463 SHA-256: 0d6932949924187699e3e980e6b2989dd26de3d8accc0c1b009274ce6f7dcb69
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious and contains numerous links, many pointing to compromised CMS upload directories or disposable hosting. This suggests the document is designed as a link farm, likely to direct users to malicious websites or for SEO poisoning. No scripts were extracted, and the document body was unreadable binary data, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://mwflower.com/upimagesfile///tiboxasixuzufadofosobem.pdf In PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c77d039ae3f---dawubumorisawilavoto.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/69hdkemif1v6h916iu21q2qibu/33375772488.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96e9b90c00---kowamoditatofipajujo.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/72logucqkgd14hddup8s3ninhr/wexogifez.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/rexuxuledomonogixizizeba.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/kotifekuxebasetoxomuno.pdfIn PDF document text
    • https://belloverde.net/emailer/file/sokixemolera.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/75003130532.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/14663662363.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/damuvaxepirixiro.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d70b85376da---wenewitemosus.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/817538a1c34c3b659c01f2924148c239/lawomunanurupomutijem.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/vibezegog.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/15e34ee473ee65c19af7982f018ef1b7/wepuwug.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/8u9a36dn29k7ie0c4qlsp4i418/tatiduzajososekumutez.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8aa4495d458e770620558c2c11326b90/39149622534.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/mofusu.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160807e5eb622f---genopebufutipiguwapegem.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aab1daeb587---39560219534.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a7a3c61c7b766daa697d47bb872aa3fe/55409142728.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/vc0btf0c3u9q6he2p6tncupqgh/muwazalotuzaduvoze.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/47686444185.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/luxitufikewokoxelod.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/bibowebuwe.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8270b25b8---1349277084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+second+marriage+novelPDF link annotation
    • 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_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D65 10748 bytes
SHA-256: 16c97f0d91a8c4b87eb074b0ff5f77ea4958ae35087852fb77534c795642d8d3
font_02_sfnt_off000125aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AA 17344 bytes
SHA-256: 2cb9dc45e6a909965d561384339d568b219a96bdc9903026150bed34f4a7a79a

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