Malicious PDF — malware analysis report

Static analysis result for SHA-256 925c1e1408b30d6d…

MALICIOUS

PDF

75.0 KB Created: 2021-06-14 22:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f1339d7caefdd823af09811f360ac443 SHA-1: c87b74cf5b0d104582f24d26b769a56569e1368e SHA-256: 925c1e1408b30d6d13592e066751f8b5f3582491a4c0b5db220d4a802d69435c
156 Risk Score

Malware Insights

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

The PDF contains multiple links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The heuristic firings indicate the presence of external URIs and link farms designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly support the malicious verdict.

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://nomylo.ru/uplcv?utm_term=shayad+mp3+song+download PDF link annotation
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607624606aca1---23374534758.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160774712f283c---63043385393.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/cae1505efe0d3f0143eb1e89c218e824/sobotijuliladomatabufe.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/dd0109c73b1df95c03b6cfef9651babc/bufodinitositabipibi.pdfIn PDF document text
    • http://bdn10.cz/files/file/12294169420.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/11524681880.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807b2589069---wozukufufaralakevovikom.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c6f8a7528---kidalexozenumemov.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b702040d0eb672fe21c4fa52759b9fb2/87955384770.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752824643bf---91295756466.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7bf73c485---88292343249.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d4e881fdc---zisisuvosogakigifuw.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607af0fd3ee9f---89780747091.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/dujazonazasunejodiborol.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 5736 bytes
SHA-256: 0e49e7e40e5172bdef80039be662b00a24b23343c0080e902604ae81668ae829
font_01_sfnt_off0000fa0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0A 10764 bytes
SHA-256: d492e07c7ae5a2134c660330acb2962da1c853985cd45e3c6b7113ee9fb28b66