Malicious PDF — malware analysis report

Static analysis result for SHA-256 473d40563c8acdfe…

MALICIOUS

PDF

73.4 KB Created: 2021-09-15 10:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c8239ad41d15b2238f6704b3087f2d23 SHA-1: fc7ac8e7aecbe856801027876b8ff0cbb50652c0 SHA-256: 473d40563c8acdfe2bbd3a62c875eecc9e54812757992b17224fa0733f273d32
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress upload directories or disposable hosting. This suggests the file is designed to exploit vulnerabilities or trick users into visiting malicious websites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=zombie+minecraft+papercraft PDF link annotation
    • http://hanasushichoice.com/uploads/files/jikilowe.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/39072628783.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/tagobogokes.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/28047089985.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/36468105689.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/pefelefes.pdfIn PDF document text
    • http://sieuthibds.net/images/files/87656641084.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/zalixovorefejumonatevedi.pdfIn PDF document text
    • http://www.siposferenc.hu/html/fuzomomuzo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cc24439fe---18464198693.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/51062621491.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2726537268b8656cbc8ba8804bdb2a55/49690765646.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/58311031613.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/55520889262.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/zesezavejevuki.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/fabapilesorilunuxogubab.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f494f83a0c---gimir.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/xokodidigew.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/tujufoduw.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/mezosetetidepuluxises.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd05c05a06---73736370549.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/77928851407.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/6303266369.pdfIn PDF document text
    • http://e-sheremet.com/img/78675708892.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/34400946129.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_off0000bc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC56 16860 bytes
SHA-256: 150599a79af49c20a323ff31bbe5b0255d88283e42d4520923d36631278857fc
font_01_sfnt_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 10528 bytes
SHA-256: 4ee090aa4851bc67033c01011456afb35e8d46bf19da864f4d42ae559b9bda13
font_02_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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