Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac869be343b2f485…

MALICIOUS

PDF

226.4 KB Created: 2021-06-28 14:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fa43467d6cd89df6c3392293d369da28 SHA-1: b28e48d245ffe80fd742d8232e779dab6d3b6f33 SHA-256: ac869be343b2f485f53ffffa3de6b62bf265c5f2555473c2948e9f7a65e16cb7
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which are hosted on compromised websites or known malicious domains. The heuristic 'SE_URGENCY_LURE' suggests the document attempts to create a sense of urgency to prompt user interaction. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with the ML classifier flagging the PDF as malicious, indicates a high likelihood of malicious intent, likely to lead the user to a malicious download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://aytekinpolatel.com/image/files/46044519762.pdf In PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/f2a8dd9faa0ccf3477e7b6592364162f/8007028839.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/tulutamoxilavexege.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/monepiwufujaxenasig.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/vilimewekurotavifamibu.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/fc043bbf7ba69eddabd9e466eb98becf/50351201341.pdfIn PDF document text
    • http://sun-eko.eu/files/file/biduwodowiwegasebez.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/4cd4f0c458be6b314d5a117e9839d439/molavut.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/5b5a7742ec4018972c5e0ae185a9244a/kefakosutoxis.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/61535468110.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/kunewomijavisoba.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/490cmdda0h97ka25si3s09ug0k/bofazenafawagilatidi.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a58136e95---tixinirofebupakugifet.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/87545719614.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6dea9cdbbfffb74f841e9d34029853fc/99389495612.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16087e3d17e296---54845374861.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/saxumunozuwuvijunaliga.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/salizomasog.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/ccd9f6a7c6ac7fa714834b6563c04386/wefuxedugosolipisidalixin.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/a06albtp7a6ft8pg0tsshc3v93/zesurelebujunumarixav.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/julonaf.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/s4drumeouv68ssbdg6f4tqlnlv/nakenafiriwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fields+of+gold+tabPDF 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_off00031e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31E7A 10444 bytes
SHA-256: 4516a09606a6115c1d34114f267164a138bccc7a85d6a3744cf8d12109d51294
font_01_sfnt_off00033611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33611 17816 bytes
SHA-256: 54858bcaec9805dcb8e66f509e4cc5110f67bf1801368dacbd07c6138769a9d9
font_02_sfnt_off00036426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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