Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af639d2ef45ef8b…

MALICIOUS

PDF

73.1 KB Created: 2021-06-14 06:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0039d8942653c535a83bd65bea5fdeaa SHA-1: 9c3ffd78a185acab6409de2fa129a21043613119 SHA-256: 8af639d2ef45ef8bef27f005eb45ba7bcfae3cbb6ef209c8438368e199594f00
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations and appear to be part of a link farm designed to attract traffic. The ML classifier strongly indicates maliciousness, and the presence of external URIs suggests the document is intended to redirect users to malicious content or downloads. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

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://nomylo.ru/uplcv?utm_term=salaam+namaste+full+movie+putlockers
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/p6vtoa3s9jp2qahc1s67rnrsp2/96552910117.pdf
    • http://temple.mo/userfiles/file/25341398627.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ee8rn1omvo8374mfj48bfc769u/xatinira.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084089fb66a7---86631309890.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609830618367f---fejubiguzikevuribas.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56e126c17---xamujiveguwegoneluf.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074196eb8bd7---nigod.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b9d3b4586---widamavu.pdf
    • http://adria-ex.com/images/blog//file/rapizi.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0a223f11a---31524218209.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c055e7b438---29635918569.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b97f1872883660a309a8524dc48edd63/tikejolelokepovijara.pdf
    • https://rabudiagnostic.com/userfiles/files/fofarasupiruvuvita.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606c84ad44c50---49438833791.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/rdevltk04r690av6g91uvlae49/44355434895.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e13a.bin
53178a5b495ebb7361b097566b294c5018b11b2e542db296dec760fab99b4c0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 5388 bytes
font_01_sfnt_off0000f38a.bin
3bf44cd7b0861fab8e8d13e4c1f74635b4be83d19a70ff958bb52a01b6539071		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 10784 bytes

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