Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95c08e0e07db9cf…

MALICIOUS

PDF

91.9 KB Created: 2021-07-02 08:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 219aa37bbdb40247e8c11100967a262a SHA-1: 8cc41c61d02ea5b6576409fb1c92bd50b2f09fbe SHA-256: a95c08e0e07db9cf894c98e24351949ef2a6e20b33088065992bd6044408b3f7
176 Risk Score

Malware Insights

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

The PDF exhibits multiple indicators of malicious activity, including malformed streams and a high ML classifier score, consistent with phishing or exploit delivery. It contains a large number of embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 https://coretry.ru/uplcv?utm_term=exercises+to+reduce+belly+fat+for+men PDF link annotation
    • https://sofanet.ro/ckfinder/userfiles/files/kubusudab.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/lagoketagap.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/cd46dd2064fbbc4be3a7ccdac92a2ba1/46705260907.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2692229d16---72156278486.pdfIn PDF document text
    • http://robbes.nl/media/files/taven.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9de32a47b---dufokesepinofus.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/66009996206.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/65658886174.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/nupuw.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160900573e7858---fanufolepojimiwuzifuledux.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/40692824239.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6785eb5ed9bb27cec78fe7aac7634589/xesevenuterozoxolijaz.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/23/file/32440807100.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d38c578531---12426278519.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/buxulisibobumegoxo.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/57380802084.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/61ee6990ea5d9890854e1c510c2c610e/zulibudafefuxejetunet.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/4ae6bf6b20a33a35cd4bb3dcfdb10b6d/43055319607.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/70025010ce37160834cc3e20d7f8f3c4/38387834464.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/q5blrigalgirqksca8g1uo6fqn/9502303706.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/70721606807.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e264128f4ccd9904e6a5568a3bdf75fe/58239006785.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/e39021f45cacb98288be70a0513460d4/44186788107.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b7cadfe0c0e378209c87305e91768fb3/16355557293.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_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 17056 bytes
SHA-256: 8d8dbc81319ffcd616717916fe7cbddb4156f0236e9f3de1234750262a48333a
font_01_sfnt_off0001304a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14861 11076 bytes
SHA-256: e24ea02c6e1f90f4a104d2e8a6d416323990f8dff9d992499c5e44a60e708ce5

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