Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15ea2ea27024ab2…

MALICIOUS

PDF

93.2 KB Created: 2021-07-07 20:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9f5efdc3b059d2aa5648cac5003dbcc SHA-1: ddc37cc4c49e906aedbc75f90a5a9927fb8f6ddc SHA-256: c15ea2ea27024ab298f1dc8bc44dad8ba00babf01969e15e6b6cd424232e56d1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://dalaichau.com/files/wobilufunor.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607288583f6ae---lizevibitolinixil.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5d2190aa2---lijosupa.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0f97e3ef---ramonufagokazox.pdf
    • http://alimentosldm.com/userfiles/file/topamibudimov.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf6217866a---93389820508.pdf
    • https://agermag.ro/mm/file/torededafutegozoromib.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/11ld439tdijjof6mmrt3o37se3/vezoritom.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9f9500cc9---45715459481.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/062469860c1fd7d1c3179484df89e9be/fegizikumefodunuga.pdf
    • http://ylgems.com/file_media/file_image/file/4518654944.pdf
    • https://kisikana.hr/userfiles/file/50095759352.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb735a340dd---12195802507.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160911dfaf22e3---35854762575.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff1d53ade7---fasasatemasinijawed.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/52593958239.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072434848252---fexuxufudasevafavoponabet.pdf
    • https://falconshipping-uae.com/userfiles/files/35037679598.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c555cd03d---mipowisadiv.pdf
    • http://pileshoppen.dk/userfiles/file/girukepakawajufa.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc09a051a8---25316666603.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nlff252gj73ljl048dmo0okq72/dapisamexemiradiga.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=den+of+thieves+ending
    • 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_off000104e5.bin
615c9d06abd6e327880ba55f496ee780e414d518e54863a0afd010562d32fbf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x104E5 18700 bytes
font_01_sfnt_off000136ea.bin
b44b06bd440e897fd76a1f979815fef4409f6fab5d39210a8a6785dd6c251cd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x136EA 10392 bytes
font_02_sfnt_off00014e37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E37 16792 bytes