Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9bf7333c4fc32f8…

MALICIOUS

PDF

72.6 KB Created: 2021-09-27 03:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 17b63abaa6851da07575b7f41d083106 SHA-1: 50b1d503d74115f910e74d7f58365bcbfdbcc67d SHA-256: e9bf7333c4fc32f83768976053dedb3ff308cae20fa5990f26dd334b39f62bcb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads or redirecting users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external links, many hosted on compromised or disposable domains, suggest a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614155ecec32f---xurajijanadafe.pdf In PDF document text
    • https://excellencetogether.com/img/files/file/loxixowazu.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/rawufaleniro.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/75410512329.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/jimapumokukagifawirene.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/wokatixak.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/gexezasejisuvutanex.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/56671641499.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/xotirezisozujapixufuwekim.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/7319664274.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210926_012543.pdfIn PDF document text
    • http://getdol.com/page_data/file/fomijinufabe.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/27604431741.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/43139326963.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d48762e76---68771994726.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/vepiwikusitedawetipir.pdfIn PDF document text
    • https://ghnservizi.com/file/soxasasaju.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6a0c131dd785f485efcd8cef45de1238/50912839705.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613af89aecc6e---56093245492.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/nuxesatedekapubonugu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141e62d12f20---botikupisebanojaxit.pdfIn PDF document text
    • https://granitnet.hu/editor_up/zenezibexuji.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ceaffc84a252e553b08f1e6a371aed7c/zomuxanajokijaxoxusizefol.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/wubeledaboxiwas.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/lorekoxovobavofizeguvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+i+cast+my+phone+to+a+smart+tvPDF 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_off0000b342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB342 17832 bytes
SHA-256: e04c2d1c0fa8a8edcb88b6adb67e8c9ef39c0439510d7ca1d447eb06586d32d0
font_01_sfnt_off0000e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 10988 bytes
SHA-256: 900e968cec8b4ebc94db3322e68e65a604d42d52a16fc4d0068b188c45e91bd0
font_02_sfnt_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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