Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a26e05066850ae…

MALICIOUS

PDF

93.5 KB Created: 2021-07-04 14:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34e24d5d3617c635ed111693bd55eec2 SHA-1: 83ed4b4b29c3938c554ad9b20e948a6187657d50 SHA-256: 84a26e05066850ae216d400104933df3641b4e0a11724b2445331b8fdcfab759
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing purpose, but the overall structure and URL patterns point to a link farm designed to lead victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infoenergie-loire.org/userfiles/file/gugekulanibipafa.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/1cb96b8b7b52579b1e9cd1b3eb970523/felosufajikabefedijumeb.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4555eea03---tubowomej.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/82d3e7d5d8bf64558d8f7c4cebed5886/23743834126.pdf
    • https://moscowfashion.net/content/xuploadimages/file/41288619652.pdf
    • http://aeronautike.com/userfiles/file/kumawixakisakirokamex.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/77e15e2bb2e76da1b84078e61e4b1ecd/761980542.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607301d0d2536---nagimororejebuxexi.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/e1b85418db8b3640175c51b766813af6/gipevumisigubamorajufojow.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160aa85322d984---ranufarazexijano.pdf
    • http://trendybiz.in/usersfiles/file/sifaralanamutofavetu.pdf
    • https://starbox.fr/img/files/jazudez.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/94b1c8194a2b35d71897cfcbae1a3d58/60845995032.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/502a22618e53f56ace05cbb13c0ca78e/61487687388.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/nedmlmomaopeb99iq65a7k271j/jodikeromumitududitujixi.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b61948c11---dulomidirejubanovedamulu.pdf
    • https://belhasasecurity.com/userfiles/file/voluvorivovuvetar.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cbb259629---xukonumirumafubosej.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/895825aeeba312cd53868397037895e7/vamuru.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/7c58c0facdced875da33d7224c393e8c/guwigopajusuxukavivu.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17d5db9734---vemowalel.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/306deacec3d8433698a50142592d34a2/mekebugujujakawedexoter.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/c1198daf9bc30ec7a8b44cb1225eda41/93828782079.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/6fec77c17fe9ecc3d42be2a9a79c185c/47391277995.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=comparative+and+superlative+degree+of+few
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f359.bin
91843226035ec5160f261b9eaec38db86b064ffa3e070bfc538de4eedf6c5b2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 17300 bytes
font_01_sfnt_off00012082.bin
597022f2101d04a1a43aa5cf195c5c6edbdec6fb201f2ecf69f29650bed496c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12082 11124 bytes
font_02_sfnt_off00013a51.bin
76ae7245978670f77437351ba543d6a778d86b3bffd3577fec67cb4578ee6d24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A51 16128 bytes
font_03_sfnt_off00014fbe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FBE 16792 bytes

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