Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4587e323a530c5a…

MALICIOUS

PDF

85.8 KB Created: 2021-09-03 07:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2030b77ef7fcdfc7cfd397ba8f6d3f80 SHA-1: 96731744901130deb9df7decd16f651cea49c9ca SHA-256: e4587e323a530c5ae0d563aaca03d35c962999398fe8d7fd48320d22a3677023
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish for credentials. The embedded JavaScript is likely responsible for initiating the download or redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=arturia+microfreak+manual+pdf PDF link annotation
    • http://imosa.asia/uploads/files/202109031149005196.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/38380289041.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/tewaw.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/9686056644.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27423bdd77---xofokewawerojoxiwewi.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/51310600805.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b8dc5d312---goxupebepaza.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/846e5317a09a1b00f946649bf1f3e5b4/49489206835.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/1c328781619576a5f16287fb52bb295d/72122785776.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/83079805608.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52708891640.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0e62cbe44f4e05c7f323ef35f2765c0a/29852652923.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807e620dd15---9466432751.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a549cc31a---81849812057.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/jumogene.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/66832668295.pdfIn PDF document text
    • http://goref.ru/files/file/90982636405.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/2b1f9eda45588237a50061edbcaca305/wokubarolujitodukomekug.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/44700684493.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/ligezumulutikizefurol.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/q4ma9u7e95ef443fg6sv5qffgm/duzodunojopozuduwuzuzaw.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/kosefono.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 10788 bytes
SHA-256: ae5b2a0885a7aa418961f36ed6c93849d15f1d57bcd201095dbef2fa8f6ddff5
font_01_sfnt_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A86 18496 bytes
SHA-256: b06874f2a04fb09bb2d86b8c4f4d2cd8297cc29f7837f686c278de8086a6a0a9

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