Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ebf1021374ca1de…

MALICIOUS

PDF

76.4 KB Created: 2021-08-30 02:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc108c61db179d8213648b63e278d40c SHA-1: f8bc638cdf551475551d293273430aae22d7bfb7 SHA-256: 9ebf1021374ca1de7c3b8b71c7878bfce228fec4493971e029e317e2e9d5c7c4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for link farms, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61ded2df74---vapajawuwi.pdf In PDF document text
    • http://assushop.com/userfiles/assushop.com/file/luvemizoxepumaxetona.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a33925ec391---zodubenikig.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/71727208979.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/5429400003.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/59922829357.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/75035307328.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d452baa56---kiworomurap.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/xirobasimibiweb.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/89752494802.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/logesupixula.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/jerot.pdfIn PDF document text
    • http://sam-global.info/files/file/minibadavepezejizabulew.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/1e4493a2e2b04d848a90f6fcaacf18df/10747926514.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c073bde3911dee158bdc56e975fce6c2/19496912901.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/dudimulu.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/pigozujotalir.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/66183beb1c5aa8cbd885d8cea35db1be/20513098646.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b1b8668353---rarebukuxe.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/p872nmeti7hm0ooc23i19hecg7/jolid.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/bapaxoxudaxozeravelemexok.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc8f340f31---68810941059.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084069bf2986---misutakudezoxate.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611b5b980d4c0---mutesisod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=is+it+possible+to+regrow+gumsPDF 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_off0000c7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F1 17256 bytes
SHA-256: cd85830561b24784729566bc90565f8c0336172538fb28f2dcd0db636c8a3d52
font_01_sfnt_off0000f456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6D 10608 bytes
SHA-256: 3c97182f12fc15267a93ccc39b620e2de1caa5564ff0d787b8852dd785449605

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