Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca463eea3779638…

MALICIOUS

PDF

74.4 KB Created: 2021-06-05 21:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 329274369bdc76e36a31c49f572076ec SHA-1: fc4f7fa2f98ff6759d6202a108aa8de8dd9c85b5 SHA-256: 8ca463eea3779638f1c475b0359e933791224d28ad3562d54dae085c0eefce25
96 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports its malicious intent. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://drafthe.ru/uplcv?utm_term=maya+angelou+graduation+rhetorical+devices
    • https://didacostruzioni.it/userfiles/file/41092464030.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a461b54fdb1---mogejegoguxowewat.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f033f51bb2---kifikikegigare.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec340d3591---banimifogiz.pdf
    • http://strandedtattoo.net/file/tobabama.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a9510857448---4028865231.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/gob4svb50rp1tj3h7gpa1kme90/tajotusuparunogefiwizidu.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609497e4ea67e---18761564993.pdf
    • https://binarbaid.com/public_html/userfiles/file/julasozowelimo.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160aebc7eabb65---verojofewosijajufo.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ituk5nr49t5d2i0pv8dj5g470q/54704689565.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/63b1d1acc12932988282300b6bfd9748/36942473648.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607061f0c663b---10121476018.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/ce0cee4718be8151a507b7c3be9568e6/lugavosuditexomosakani.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607051b2521d1---58710888478.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/191gmabgr7k81ihsskd5uen8p9/repikelepa.pdf
    • http://ranaghatpchsschool.org/userfiles/file/89867892239.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e1.bin
7195f3921047d1088dc39f95a725ea79e00a0f3af442efa362fe83b3a898b656
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 5248 bytes
font_01_sfnt_off0000e9bd.bin
c9dd00773cdb9660ad49d22400579a69011875660b8aaf03d7a7b21a60788bb9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 10156 bytes
font_02_sfnt_off00010c68.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C68 4324 bytes