Malicious PDF — malware analysis report

Static analysis result for SHA-256 551d420a2de04613…

MALICIOUS

PDF

100.7 KB Created: 2021-07-29 22:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 7370968efb99fd9dbb557c43de22c900 SHA-1: 927ccdf0f25525a93b281e48e75cb05db275c783 SHA-256: 551d420a2de046134b73602cba3aaee4b299f338a2e22d75ed3928351ec2f766
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://chcial.ru/uplcv?utm_term=igo+primo+maps+europe+2018+free+download+egypt PDF link annotation
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27827618122.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/dojinizevofig.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/rejuzejikikotuxagagafaz.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afb6028012b---91570417430.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/50261405100.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/toduluwapameg.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/tuliturutoz.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/afvbbhrg7enm894o1sqpvr5kq5/tegikagawesusuzajidufivu.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/tudidomili.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210607045003.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087448eb53e0---11399496909.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/f354a901a085e32b436d2e7e183fe7d8/85071912497.pdfIn PDF document text
    • http://short-story.ru/upload/file/gekob.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/vufamid.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/77857083144.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f205245f79---13415999593.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41fb9c7b4f---ridaxenenulugaxuduno.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/zonovulanarizasiru.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b2793e5c2---dozakoxim.pdfIn PDF document text
    • http://blueyee.com/upload/file/140703412784.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/13248nioarq3usbs256qcpms33/14771834941.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/bf9e2579974829810ddac5467008f59e/zavatezuvas.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a81d4bf9e---8893513937.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f568e9cc323---19670910793.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11758 16336 bytes
SHA-256: 0ba07f6d54a4cb2ae74247f97c6a926e6d6308299df35fe3bea2e399aa3885da
font_02_sfnt_off00012d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D92 11596 bytes
SHA-256: 2e260461ef2791e4614f76642cccf82af08540db671ec58d49cef223f8610d7e
font_03_sfnt_off00014917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14917 23796 bytes
SHA-256: 4ebdcf6c25b107968e11dfbeaf487038b862b9e9694a5d97829ebd45eb64d800

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