Malicious PDF — malware analysis report

Static analysis result for SHA-256 b045cc252c0f39b2…

MALICIOUS

PDF

158.2 KB Created: 2021-08-11 00:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2558943e2e5f043754d50c9f352d4838 SHA-1: efa13c31e276203d797903101bf4ae9a9693ec66 SHA-256: b045cc252c0f39b2a70ebdfdfc657d4093c19bef39af67b25365473790371278
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or lead users to phishing sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9803501ce3---lurizidebenunanube.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/2suhfftesjt0faoeg77d60jl6k/7234408882.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/19475412501.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ea2d7d03a---vubipinivejamip.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/faqjqrtl5kst5a1vgg4iplmuph/masawigapalam.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e5bf80a6132de2c05fee284e0a5f52d5/7239048798.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/86322635717.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16088251f6da56---47634261870.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/87985867288.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/nadusuxi.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d9dbb7b00---rezijegugofadex.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a8ed44a95---goredijotafuwozukinofo.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ubmicht379m9rva9nsn2e3pj13/jexedanibukonub.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/woliradibijojilafefabij.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/r4kn3c76leu62khgljq4t762t0/siwevo.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-6/20210506030815767764.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/a94de4fa0460c7e3b5f0dfa35825f592/pelumetexuma.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45bedc540---39180978033.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/87681239643.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/80292173850.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/unn6p37e02shn7ddtioiln5koh/bowomezovabilipopimi.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/muwavakomimefevava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=libros+de+harry+potter+para+leer+en+internetPDF 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_off00020491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20491 10700 bytes
SHA-256: 686b07f08ad9dfaa0e2dc8500941965c44da7027451d2a39fc0dad34dbd27410
font_01_sfnt_off00021cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21CD1 20808 bytes
SHA-256: 8e1549e222fba649314e79606d87adf0dd414b7a60d3f81023bbb99f4510dd78
font_02_sfnt_off0002527c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2527C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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