Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d0f0a5b3a4ec70…

MALICIOUS

PDF

80.1 KB Created: 2021-08-17 20:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 71259e8a934318cb43eb24f2627e0463 SHA-1: f6338ee4a8949c342da50154b2641a7d65c14940 SHA-256: 61d0f0a5b3a4ec70fb2cdd489123251112f66dc14b83634066cb64cf429510fb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a focus on directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/edvfrp0o8huvbs2u2ghrpb0cj1/95841716793.pdf In PDF document text
    • http://traiteur-ribot.fr/userfiles/file/30846640362.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/figutevemotofemaxix.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609634a3b0604---bilonapubukobolenuberexa.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16088a6d969900---75334512684.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16109c6597d0d3---47284852335.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b1e372d448c3fc67978e49fbc64c93ae/libawofafifuno.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/fojevinizilo.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/dunawekafufilulabawibag.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/mubotowabasemu.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/42023199603.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4388adf24c---48172509535.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/5247369149.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/kujagadobabon.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54a43c2ab7---40958157150.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/38440762197.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/34113782497.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/sovenu.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/53562969925.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/beworiwojonepawaguva.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/45394929340.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/wabepozesigepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=bose+acoustimass+15+series+iii+price+in+uaePDF 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_off0000d3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B3 16876 bytes
SHA-256: 78ed2e8d5a619a4a9c8859bce6120f2df95277fcaf203421b6f6cd8ea9aa3fc3
font_01_sfnt_off0000ffca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E1 10828 bytes
SHA-256: 5cb87d36ef1d3ca3b74e30c435167c17a1f1f305bd724644c50202f5693ef2a8

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