Malicious PDF — malware analysis report

Static analysis result for SHA-256 96de2e6512ed177f…

MALICIOUS

PDF

117.3 KB Created: 2021-06-29 12:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32c6886f620b735880a3e6a393256144 SHA-1: e430f9b89d82fca13d58628a995f71e24caa9e64 SHA-256: 96de2e6512ed177fc58c9175034b9ec19d8252adda2eb46c57b80e14d9fe488b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristic findings point to a link farm designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=conservation+of+energy+non+conservative+forces
    • http://vorne-sitzen.eu/pcms/content/file/10019510155.pdf
    • http://king-ber.com/UploadFiles/file/20210618060613784.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/87228976d1b83f5d26bab10ab1f06f0d/fonobezogomopitajedego.pdf
    • http://btc-ltd.com/upload/file/sejazopusumes.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b69b17b459---67624219254.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8158e4e1bb---polutarekezixegosewu.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/388b223a3c878c61224f7fae5a52260d/32167896224.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099ae3d40f95---fexejidavejaziviravit.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3e198303c---nipuxizolazuluva.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/iaat1qq4qo47bd5vpt2otjv835/24547936490.pdf
    • http://fructusartis.com/i/File/84137781060.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160768fa075039---56068606655.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868ee90a05d---lepegerulesajagewurewuxo.pdf
    • http://imcborivali.org/userfiles/file/42732268963.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19ac5bad46---natibavodudenubub.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b997614b469---guvidozosiruj.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/ranutometenu.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/bk5034cv96ug08r1taun4i2jmb/72356382897.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/9dl7vjb5m73d88l755ro95qfc2/18418160840.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/28c984d652653e7f563afb83c769a67e/55452542050.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/65a833d7442025742473ca6068f595a4/bajojudafevudu.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd46b190ae---pofisutawavesuwamixalo.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607299a49d989---niwaduxubideri.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2decbd67---zomajox.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ccaba670d23---melodatakifebure.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014622.bin
a95fb8bfdd68e782f8a88ae07838d6121cada51fd32d30728560daab8d0c91ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14622 16520 bytes
font_01_sfnt_off00015d22.bin
046698b8794ef33a4c7edbf766e3bbf832f0335bd32178443f549054dae73f9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D22 21316 bytes
font_02_sfnt_off0001963f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1963F 16792 bytes
font_03_sfnt_off0001ae56.bin
3500e56f8bde9c7c73221e1113eb52e53d5fe1d7ba255f610b3457e863116030		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE56 10676 bytes

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