Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c0141aeae4b4cf…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 07:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b269dead08f4b6760ebd5ef39a7759f SHA-1: a34490e543b4cacafbf6fde7447bc31f08ef2102 SHA-256: c4c0141aeae4b4cf5009f1ede39aeaada9f6430159b0a3dabbb305fad1bd7735
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards an attack pattern involving spearphishing attachments leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://fuze-pay.com/ckfinder/userfiles/files/82102499760.pdf In PDF document text
    • http://orenprom.com/img/account/file/basevevuniwirixedi.pdfIn PDF document text
    • http://grafitym.kz/files/file/74953201751.pdfIn PDF document text
    • http://perfectprojects.ro/userfiles/file/jibedididizufarafunigef.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/6a1559572ebe8e3501727b58e1230360/86176044391.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/dikekoxizene.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0e0481190---pevuxilisofajoluzoti.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/4969398562.pdfIn PDF document text
    • http://zamgph.com/uploads/file/032201309021.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/mevakuv.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/pubozukekovomevadajimo.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/bedenodad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f541df025---xodosaza.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/74771035891.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/69703583490.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/31606031984.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/26421858873.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/8155627592.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/dedugimekafedefomaxatokip.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f5e46701f---29196225870.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/wumojenowobimenagusajodo.pdfIn PDF document text
    • http://netart.hu/userfiles/file/73205719650.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/78a2ee2fe2ff61266e94a40575be6da0/lifufavamekose.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/wufurewudixatakul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=el+principe+del+sol+claudia+ramirez+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_off0000d8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BC 10828 bytes
SHA-256: e1e380346f0143be644f6042b8e3e432595849eda9d7f502098935323f378f32
font_01_sfnt_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 19744 bytes
SHA-256: a3210b8e824e2d3406b821da1b98dc79ecde169fd2ebc9ae8f1e271e569ab8e5
font_02_sfnt_off000124c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.