Malicious PDF — malware analysis report

Static analysis result for SHA-256 40564aba8e18c871…

MALICIOUS

PDF

73.8 KB Created: 2021-09-10 12:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d963484f64cfc9a17bd7a6abf5e6febf SHA-1: 08ead555668cc5f172370c89970a45bf2cb94f7b SHA-256: 40564aba8e18c871ec96258ec8fca22d48cf2845839f097e6555f3f7a6ccf934
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious content. The presence of multiple external URIs and link farms indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://daaeportrett.no/upload/file/norivojufetefesiro.pdf In PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/92280394977.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090419135985.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/96614640213.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/woketevibusimuvazem.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/jodab.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/vagezadaxuzitoguxem.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16131db2505b00---pagadawixo.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/9105098520.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/nezexivawasa.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/fuxebazu.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///84666659159.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/96390715502.pdfIn PDF document text
    • https://jagominum.com/contents/files/6347743698.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/3052328721.pdfIn PDF document text
    • https://protrialse.eu/files/files/50914590977.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/c24d04a87e74df0fbbd966aa59e56afb/40649988310.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/wovorazivufi.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/95250095903.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/levenoxapifaviwatev.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130be919e874---59878090996.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9872a0c0---muzezejijepifovotuvin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=alphonse+mucha+book+pdfPDF 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_off0000bdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D8 10908 bytes
SHA-256: f2c9f64141f6ae86a71572edc94fbd40738e6ab154f09bc1566ec88c76162bc2
font_02_sfnt_off0000eeb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 16696 bytes
SHA-256: c1e3e91813c95bf2d0ca9af4b45fead483e1174dfd85557665d950c1ecc3c085