Malicious PDF — malware analysis report

Static analysis result for SHA-256 539e211d9401ab2b…

MALICIOUS

PDF

77.4 KB Created: 2021-09-15 14:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98ea1be4d88616dc563624b555fc3658 SHA-1: 7d1ef1421d2a9ebf8d0a191060575dad5bad936e SHA-256: 539e211d9401ab2b6d0152de131ca6ddf429e672a4ff8dcb956a5c44a91394a6
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised websites, indicating an attempt to host and distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://pizzeria-millemiglia.de/app/webroot/img/editor/file/2483356116.pdf In PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/19578745756.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109110623164871.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/10729687661.pdfIn PDF document text
    • https://atavio.ru/files/file/xomukamol.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/jomurumufofelosisadezut.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/bimulix.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/24175603476.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/davitiserenafa.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/77876097755.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/93142876090.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/69243200259.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/voxokomibiduwiwa.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/vobikesekilomob.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/bofalinajubusovu.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/pilizefeva.pdfIn PDF document text
    • https://orrizon.ru/images/file/zafagijiduxaromitoj.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/96227587366.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/saq9b5sqv7l3lga694lrhpjem5/dexik.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140701f101ef---rofebuzabarulotijilerimub.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137d0f50b996---pivupefofagujusifizexux.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/jetavigiwuvawawatetovaw.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f453a5f689---kamalu.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/80848700326.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/xutuduvas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=a+word+beginning+with+nPDF 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_off0000cdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 16980 bytes
SHA-256: c5e8d01937e30445ee30697158da5b689bf4d85a169a6ac6e1832dc3d52ba6a8
font_02_sfnt_off000110df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DF 10360 bytes
SHA-256: 7a567f4e338a9fc92769b6513271ee3598e31a6fba544e32381d8dbab1024ba2

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