Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c84239ef4e4824…

MALICIOUS

PDF

85.3 KB Created: 2021-07-07 22:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e7cdd83516c5c675617c1f3a5a234e5 SHA-1: ab5a9cd600b1fab51999a0358ac211a543c05e1a SHA-256: 98c84239ef4e4824693e47811ab86a250dc7ebe40f2810e00647def49f2c9ba9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external links, many hosted on compromised CMS upload directories, suggesting an attempt to redirect users to malicious sites. The presence of a link farm on disposable hosting further supports a malicious intent to distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=angry+birds+2+silver+and+red PDF link annotation
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/e2308d1dda8bd6d9b4c38a4785a50865/latuku.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/xenizopobenumenukexi.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082a7d491865---zegevodupusezolepubaw.pdfIn PDF document text
    • https://ferropula.hr/files/26111938389.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/42613455506.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3a0cb0d23---197715836.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/49460843779.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086e651dcd58---lubumagulanop.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160db4606232ac---vejowuxopofunabigawaxip.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/c6cadfb8b62bcb35996d9f11b48f3540/veduzamowa.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/degovanigijinowosi.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ed6fed9be---23205999387.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0febf228a---fopepez.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/93456839041.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/17475757061.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7bf5148b7---51307118256.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/7186889954.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/fegaporarujur.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/tejikisupugodur.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/35402009435.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c741d310fb1---rumebex.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160dc93a2cc0a2---diletuzagis.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///30215903102.pdfIn PDF document text
    • 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_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001047a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047A 10628 bytes
SHA-256: c8c3245f415e298e99559a35cdcce51b623d8e0f5aa52ac4b654c7572f3cc5bd
font_02_sfnt_off00011cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBD 16736 bytes
SHA-256: 2e523efbdf33dbb81ec8b2812d9e240bd8ac929745f8d29a6481510a5a0edaf4

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