Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcb02cdb69c4cfa…

MALICIOUS

PDF

78.6 KB Created: 2021-09-05 09:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cd0033bfcab1d114f8e15e5316d674a2 SHA-1: a8ea43d54e56372b33467855b39e449d41809040 SHA-256: 8bcb02cdb69c4cfae5308cbcf46779ae34aa9ddbcb6aae594de1bf6567ed3387
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple links to compromised CMS upload directories reinforces the malicious nature of the document.

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 http://hotelniagararimini.eu/userfiles/files/zakesonoxitogapopugisipux.pdf In PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/k2ilhvhfp77pahoccl8gspq2cn/14747292348.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/xagexujonefiviwijefigopo.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/rurixad.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/44857534003.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/laxabepa.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/fowina.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/15105077923.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddbecb0f99---33198708982.pdfIn PDF document text
    • https://synersys.fr/contenu/file/negopifotiritijesalan.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/hqmdprnlf8ru1bk6hdd1probt1/bikafidizuzogavuzimavonug.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8362420154.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/jemiloxufupovu.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef33e616cd---zasokil.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868edc74d30---dewaxamomolinav.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae343940d0f---68546802852.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///zibuxovebugum.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/78898916613.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/3019920832.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/30181612804.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077c72937a1f---roxiw.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1627244342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=showmeyourdrills+workbook+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_off0000ca5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5F 18784 bytes
SHA-256: fd143dd5f3d0c65481e3c1d1eec0d21fa90d15a0e42ca557755ed0c5faa76fbb
font_01_sfnt_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 11004 bytes
SHA-256: a263e78b2654e8f7eb3decaa6d282203adbb9a1012025db1ea3cb2ce0188fda3
font_02_sfnt_off000114ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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