Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e80228fcc37d7ff…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 18:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ec7bc3cf79677e42401b21c86ca846dd SHA-1: 70f50f29be07f1c5c1f20d1c8de74ef54ac011e0 SHA-256: 6e80228fcc37d7ffa8d72ff65e8fc7adaa9ee2274b9ad2c8a4bb8f0b20dd5f00
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The presence of embedded JavaScript further supports its malicious intent, likely for obfuscation or to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://emons-verlag.com/testarea/cwsCMSlight/media/files/82235346275.pdf In PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/walirulosevudorisekomo.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/voxuvelafawiwares.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/48306656527.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/96325555415.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389e83e119c---85112501100.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/40714381288.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/liromi.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6135f30893e30.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/figoxupuxaverojute.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/30675252594.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/wekamabadabar.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/bapejizonuxexurureraz.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/77094466599.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/xorimomexomamuvuxi.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614260081bc90---vavesidizid.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/paritose.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161327087a2e5d---87475603489.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/65255743267.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/22398882905.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/fasepomibufabimizuke.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/folotovasonopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+league+of+legends+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_off0000e401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE401 10620 bytes
SHA-256: 150f2e5013f46aa52daf37ff22eb976ed8b42e96a4bc490ad975c322a9a1c296
font_01_sfnt_off0000fc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 18672 bytes
SHA-256: b7b8b2f3d3c099afa6c4053accaac7f6af907058fc6746939620ba695e0f3682
font_02_sfnt_off00012d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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