Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ee1d4c3269ebb4…

MALICIOUS

PDF

80.6 KB Created: 2021-06-24 16:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6a1cf2a8267b27044795d34e0fbf9192 SHA-1: dcc86bd2cea03cb1aa63a263f0b2701a7cc2ce2a SHA-256: e1ee1d4c3269ebb4b8956edc78e1ebb5cc2837cda9787251e794cacbb38a653d
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 0.9997

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://irlanc.ru/uplcv?utm_term=%25D0%25BA%25D0%25B0%25D0%25BA+%25D0%25B2%25D0%25B5%25D0%25B1+%25D1%2581%25D1%2582%25D1%2580%25D0%25B0%25D0%25BD%25D0%25B8%25D1%2586%25D1%2583+%25D1%2581%25D0%25BE%25D1%2585%25D1%2580%25D0%25B0%25D0%25BD%25D0%25B8%25D1%2582%25D1%258C+%25D0%25B2+pdf PDF link annotation
    • http://kimhoatra.vn/upload/fckimagesfile/gasolepusipusixizobeti.pdfIn PDF document text
    • https://basisnomor.com/contents//files/95595318592.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c369f660e03---somudibu.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/nagemajumafuli.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/4koir0e8499ph7biuvt7tfbfim/12668014808.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160804945b0cbc---fofimafesuravos.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/27713744748.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/e2ktn6bg9ca8j718uvv179i46a/nuguw.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bdee5a25fde---lizelikegosojarawu.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/32c04ef3ef4427762978c8cef0667d92/rimarigixidusubaje.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4c5399b70---41569085636.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/witilonagaradudu.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/funalajarinopu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/30280ae7aeb34fa6fc66b429a436edff/titix.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/difumusive.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 6100 bytes
SHA-256: 77e7c0f2fd1283a0f51fa467f8c4d342f33d3d0ae64640351bf88b52332ce871
font_01_sfnt_off00010157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 15788 bytes
SHA-256: ea15c5e1e7eb826d18740949569ff9809eef8f8518629c5e9de345cec987c11b

Open this report in the interactive analyzer, or submit your own file for analysis.