Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b1dc1052359b63…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 12:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fb8c77d2f36f246ce0b2e19c9f91f883 SHA-1: c1d49eddefbbe1f37503ad6b1ef249ab739416b1 SHA-256: a0b1dc1052359b630fa207c268e645184d3e4b2c582266facf2238269436c1e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' point to a common technique of using PDFs to host malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://nage-z.com/ckfinder/userfiles/files/25942997510.pdf In PDF document text
    • http://marketingnews.fr/images/file/55849358291.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/19835792844.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bafa76169c---57125194482.pdfIn PDF document text
    • https://teamcode.net/upload/files/63912338825.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/vanijonomebi.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df37feec7c---16085419302.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/91976639973.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/walopamuparokeputinewajin.pdfIn PDF document text
    • https://ms02bet.net/contents/files/84218553268.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136cb8c0e70d---74711423340.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/59657777541.pdfIn PDF document text
    • https://auto826.com/uploads/files/48092289470.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/2d354217e082176d2c0c60b681fc4381/4195800095.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/7160102266.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/25430229403.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/88233717774.pdfIn PDF document text
    • http://keitbg.com/images/files/25836248728.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090518060394.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/notafazoximefonigaf.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/jefoxosumevonid.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/nadapinuxoxixe.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/wuwedalitinojumesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=office+smartphone+androidPDF link annotation
    • 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_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 17456 bytes
SHA-256: a6cdc1e6a65efb8a42a4b00a8a1ffcc8d81e0911250f4e262193b05342f104ec
font_01_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FF 10864 bytes
SHA-256: 9f227d783764f71c1754e30731c9ebd220a6e344b7f5c41f7db6fc319d386370

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