Malicious PDF — malware analysis report

Static analysis result for SHA-256 8056ecea2fe1299c…

MALICIOUS

PDF

87.2 KB Created: 2021-08-09 04:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5ec6f0791f5b517957b0b1bbf3b5914 SHA-1: 403f4f60bb032938731b396dba165a2d855bd42e SHA-256: 8056ecea2fe1299ccba55b2b54f6e96684e2950f3d9a3189a683ebc5e6c30608
96 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites. The document appears to function as a link farm, likely for SEO poisoning or to redirect users to malicious sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://crewmak.ru/uplcv?utm_term=summarize+what+happens+in+act+3+scene+4+macbeth PDF link annotation
    • http://e-skala.pl/userfiles/file/20525474621.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/tljlj4f3k5kpc757pqqnd0m26f/nexezezupefiwosoviroxamaj.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/m53po4i0b54cicm310dpnjgkbu/51059661847.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739feb4cfef---86702114767.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160832aa6657e1---90630386091.pdfIn PDF document text
    • http://flirdining.com/uploads/files/49265104018.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/womawi.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160987f67c674a---moriviwirexigenoj.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a82dcbe55---vewapare.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/54659443107.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/16113467545.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/8s0p5n2qkqaemqrdit2ivrpfq2/19091463058.pdfIn PDF document text
    • http://midlandhigh79.com/clients/866549/File/57996598151.pdfIn PDF document text
    • http://stroi-sistema.ru/img/29893334950.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/15f61437c20ac5489e422e709587161c/runekerowowiniwisir.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0f9ed53d8---8510822240.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d221bc9ab9---dutetafumubagamu.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/fejelibefaf.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/93803846804.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b4984e6e0306cec58f9ebb443478fdfc/tisiboselufem.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/35903829295.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 17468 bytes
SHA-256: ca18017ee94af9fbeaf7f6dce1978ef84c54b1eab020431d5c9796127df0415d
font_01_sfnt_off00011cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001350b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350B 11184 bytes
SHA-256: 1db653b9619331722b8bfbd93315be9bf2512b951be00ac5bdd180210ef36a44