Malicious PDF — malware analysis report

Static analysis result for SHA-256 850b48bdeafd3e13…

MALICIOUS

PDF

75.5 KB Created: 2021-09-22 10:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e663bbeaa3e3634a287e61cd9c09d12a SHA-1: 8ca98d8b5c7ab6e74001f1be45c6997b2e9d71a7 SHA-256: 850b48bdeafd3e13f75f48b6a7f1dede68380383a431182880887963751fab8e
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/evm18r874hlbmh5892oqj06jr4/54955428393.pdf
    • http://csp.hu/editor_up/buziwemavudavamoxegopegax.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/wuzewuv.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b68ce7ffb---nitojegudomev.pdf
    • http://p-itos.net/admin/userfile/image/file/sidibimegi.pdf
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/kebaf.pdf
    • https://mps-india.com/userfiles/files/wexusinokexulux.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/17643176242.pdf
    • https://ms1oke.com/contents/files/gavizivifurekatoset.pdf
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/33969867681.pdf
    • https://kampusogrenciyurdu.com/file/95997191811.pdf
    • http://parmalab.it/userfiles/files/nizigavason.pdf
    • http://slsnn.ru/content/files/kipefed.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6e20c8768e190d96864dfc685d5df0c6/39129545528.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/rulefol.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614764c285a74---mivele.pdf
    • http://zhouzhuanx.com/v15/Upload/file/2021913846504980.pdf
    • http://namhungholdings.com/uploads/ckfinder/files/malakekizi.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408bbe0c16e---fanegisite.pdf
    • http://jinistudy.com/_UploadFile/Images/file/48299207760.pdf
    • http://www.jfac.kr/ckfinder/userfiles/files/xopagedopejosi.pdf
    • http://kutscher-customs.de/gfx/userfiles/files/90517848904.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/b306883967068e8bb9ce33f6ae827b56/kimipadodobodosowu.pdf
    • http://rovitek.com/userfiles/file/junizokozufepamapu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+free+internet+on+android+without+service
    • 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_off0000c3cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CD 16792 bytes
font_01_sfnt_off0000dbe4.bin
1fa0c664fba18a0289ecefefe6ec7d0c40bfbc2de16cc8309394ebf60cb66b5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 10952 bytes
font_02_sfnt_off0000f517.bin
484be03e92d8c8dbab46967ac706e532fabab7c970f9623c3ab674255170c03f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 16528 bytes

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