Malicious PDF — malware analysis report

Static analysis result for SHA-256 820a0152f5eb3ed8…

MALICIOUS

PDF

77.5 KB Created: 2021-09-01 15:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89ecf272e30bd6d69e5b798751f073c6 SHA-1: 8fde39e4a486bf7821d9385cf304f51414d0ea77 SHA-256: 820a0152f5eb3ed87ec3bcdd6ef9d048c53d7ad52c10af90b3724533647729bf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=what+does+coryxkenshin+use+to+record PDF link annotation
    • https://powermailer.in/userfiles/file/9517954390.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/4stbubssjl6ik2hfbke8vq5dnf/vunivifalijigigevojejeza.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5ac4d7c41bd5029ed0e63a1c142a372d/tajikiro.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/oabbnmi926g65g87iinpjfmdcr/gevunega.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/db90d17bb369088866be02c21f8855ef/87537137508.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/xukifuwen.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fec4cb7722---90749423679.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/7rp598avm6gda9pmeamgv52mvr/77930905735.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/uciddmha9fmp84p6qs662ctrtg/dekib.pdfIn PDF document text
    • https://vestol.bg/files/file/noriremenojunove.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/mofulubakovewisedabevef.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/kosiwudefelatojejigade.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/48491514459.pdfIn PDF document text
    • http://mramus.com/fck/imagesfile/96573556801.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/78348140668.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/57125257923.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/gavimujimexesatobo.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9016357e07---xinapazexibuwezexumesava.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/sumobakomojawu.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/gepexokirijanefokutumepob.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b095585d2b51f21610f355f583667627/sulipurufubo.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1625331111.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/gesizem.pdfIn PDF document text
    • https://activepymes.com/pub/file/56438754922.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/vewofujaloronewidik.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_off0000ca18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA18 17668 bytes
SHA-256: 228a13a8a3db920f3074f13396f69b56366f3b29de66ff7b6208f320790650ae
font_01_sfnt_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F20 10824 bytes
SHA-256: 103b91009037ec95fb5c3dbbebfbd5313a6aa6be75e30c2951671ddc6efbdb4e

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