Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1bf8f734c86751…

MALICIOUS

PDF

111.8 KB Created: 2021-06-09 14:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4be5603a254145833c06a17a50be4f4e SHA-1: 8e3d0e5089b18aafe0cdceb518149e22f3d5e467 SHA-256: fe1bf8f734c86751474c946c57d4cc296bfd894d57bbbca8bb9a33a49cec4021
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed for phishing or malware distribution. The presence of a specific URL related to "Luke combs dive mp3" indicates a lure to entice users to click on these malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/uplcv?utm_term=luke+combs+dive+mp3 PDF link annotation
    • http://tunesistudio.eu/userfiles/files/25532327511.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fitowidexofuxetowofog.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/70945239191.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/slsqkkm611tleb80n1ac7ul6i0/74418056792.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc89b96ea---xorisavowom.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf797a510---monomibapoxixevarez.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd6d49b0ad---49875541359.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f476cb5947---31752978851.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/gerubekizefi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/242746cdc179979a559bb18e7d297f89/wironosegurobunuvox.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/bf0hse1cnlrm9i54o4hvlmla1j/naxetogakavofovudogiso.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9d5fe311a5269d2b9dba5a198c73d331/30840607043.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bf9f0343---35928968422.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/cd14e4f5ad2956901981d0b0c9de2d2d/18714988993.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/6768882176.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_off0000ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 45876 bytes
SHA-256: 16cd253e68acfee482286294e3efc3e589137bc1725370e2c52e7a8a34c34572
font_01_sfnt_off000178f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178F4 5248 bytes
SHA-256: 88b4e1d96c391392dd7fa96bf7300e17d04650327fd41225bac3286365435f94
font_02_sfnt_off00018acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ACB 11692 bytes
SHA-256: c841d517ea63812f7f31e90690835777e908255cd8223ccc749054e55ca89577