Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a3f27ec2eab43e…

MALICIOUS

PDF

87.2 KB Created: 2021-06-11 09:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d34705b288708d8292c65126d3e7661a SHA-1: 2a58b86b997501dcc03f857bef389faf714cd2e0 SHA-256: b8a3f27ec2eab43e852fc12d665ba55e9cd4ecfaa9c554c0b9cc4a7fc2b66f02
96 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains strings related to search terms and application details, likely intended to deceive the user into believing it is a legitimate search result.

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://pixomot.ru/uplcv?utm_term=frankendoodle+spongebob+full+episode PDF link annotation
    • http://handbook.hu/upload/page/file/15693236716.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8edf43be2---dikowininemubetipusego.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/lazuberosajadexe.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607397774e107---63752995097.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aed6906a2a4---zajenuwoku.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16074f90edcb9e---pofikilawuralu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098a70f5c25c---90412708739.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087e50d1821b---33793509902.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/tulef.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/gumepisezid.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b2cd5cf22---polaluxobexozavojape.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/22182975066.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/7hjogun6dst0v6nk1v2bk707l7/22024682940.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/80750455176.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5b9a3b819281e93cfe08d1bb515153b2/tilelasulaxenuguv.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/1b5069761617a96711d6b645246390a2/68170249407.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 6080 bytes
SHA-256: 9c62b243532ea6c73bc25af59966ee651e16a1796fde04fdc1d9c14f8ec98867
font_01_sfnt_off0001164d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 5368 bytes
SHA-256: 281831b082c6248ecec1c970d35805bf11194a6e2300d537a9381737ba6ad0c2
font_02_sfnt_off0001289b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289B 11368 bytes
SHA-256: 19f4b4e93895b4b5702108b2fedf957d90551533d330a4eb14376ff053f2af8c