Malicious PDF — malware analysis report

Static analysis result for SHA-256 4831607dce85d2e1…

MALICIOUS

PDF

69.9 KB Created: 2021-05-28 01:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94a9061bb8e6a6f716301b512acd4170 SHA-1: 75e627f8b6e6e81b010669f965250d3993520474 SHA-256: 4831607dce85d2e1875f69fb995f4a70c11534983fda2e432bedd53f70fb1fce
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the structure and embedded URLs point towards an attempt to direct users to potentially malicious external resources, likely as part of a phishing or SEO poisoning campaign.

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://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/520b7d47c3a10c7b0c4d2a9b50b13bec/65377574698.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/0e4163e04fa74d7380729fa8d834b440/77884867495.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3860f3c003483bacbffa7de927870185/24539401349.pdf
    • http://habitat3.eu/userfiles/files/90053192700.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2754672eb---79669102372.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16087268424203---70339696437.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1b1b0985f---94829255748.pdf
    • https://hgb.se/filer/file/99816127477.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a7656e5e---6768841120.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/ace6a3499e05f3745cd8375b67d3e25c/85725348734.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/qg6gl3nuqkre51cp7gkfu6qfa5/91789753734.pdf
    • https://boyanbolyarski.com/userfiles/file/fiduz.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/823d68354dec947e6731418935810fea/wusapinozegowigivoweja.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084135498cf5---16099409537.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607708e3bed62---xikorekimodu.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078f446cca5a---37816759358.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=alquenos+del+1+al+100+nombres+y+formulas
    • 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_off0000d32d.bin
5033a04419a6ba6a739f338556547a587de51b87d4f8bc425b7af94fe9a21c1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD32D 5604 bytes
font_01_sfnt_off0000e627.bin
5ca58d1e14665f690fcfa5ae417ce45079363811d684abb152e8bde1349b64e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 10620 bytes

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