Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d2c0d910b475e0…

MALICIOUS

PDF

90.6 KB Created: 2021-07-16 22:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea057f5731d2e9db96e6e42c822a17e2 SHA-1: 725b93ac0364bf3a1edd5c02fdf730b98068859b SHA-256: 72d2c0d910b475e07ccbd4ee7eaec93854f599a0bc385c397417615a2d92d439
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains numerous embedded URLs pointing to other PDF files. Several heuristics suggest this is a link farm, with some links pointing to compromised WordPress uploads, indicating a potential distribution or SEO poisoning scheme. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://bouveau-consulting.com/userfiles/file/67991555537.pdf In PDF document text
    • http://csc010.com/userfiles/file/20210625172658_oimbmf.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/sididibaxipajozoninuj.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/19910917243.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/38930651669.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c532b37f467---32782649582.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/d1biqp4jivh9b7nplnp82kprf6/74618836370.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/60727720899.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/03237d3104b7fd216ae16c4f86a28682/99795543482.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66378470648.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/6749008751.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/jomikajovozate.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/78b0e9693e43a392a1fdf98b29723986/mosarasemopofiz.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16079b5910c5b6---tiwekuj.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6f512f3ef3d9de2b770239c71f7eabe1/ruzitakusezikibamelox.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4fbb732dd---wibik.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/5593543795.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/38741143381.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/43aa3972b84914688f58a9fcaf750909/buxinudigawisefebanof.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608043931968b---koluma.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/6fe7cd22e0f5390d67b762bf9aa858bf/koluzetowatoxobukojigo.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/90638217276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=i+will+chair+the+meetingPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/23440232687.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_off0000ff2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 17644 bytes
SHA-256: 9a75d3194530f8cb7dc74a18f16d375217d687b25fae06e2190842825f1ad056
font_01_sfnt_off00012d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14577 10424 bytes
SHA-256: 21bb8121e5ceaa4095c80f45aa40217c215ff8a3d629dac1d4df39a1349a3712

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