Malicious PDF — malware analysis report

Static analysis result for SHA-256 9503495853e552b3…

MALICIOUS

PDF

68.1 KB Created: 2021-09-01 00:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 739c56493839b31b62d06de4d27bd259 SHA-1: c675790bc6a6cf2e2a31aa9f95855e0e0f5a78e6 SHA-256: 9503495853e552b3358fa4734c19a59b24a9bb15c829232e8dde63669b41fbbf
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and potentially malicious PDF files, indicating a link farm designed to distribute further malware or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://bahtiyardishekimi.com/fckfiles/file/mufetefuzedejapewijow.pdf In PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/rijoxawoz.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/vevogixopiwidifimogawo.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8be6c7e180e55c813d7007348c4778dd/goxawapilenake.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087fc1cd9e46---5901007829.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160703ffc42da6---vonupexefofarotowiwogazad.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/mizaniwezavabon.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c71e63e79c8---bewem.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/404887736.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/56075348080.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/33493080049.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/31718760083.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/69a9bab055s1g1dpjfornvi3mq/27653113330.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16070f87e9c7fe---92303193636.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/34366493246.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/genomerab.pdfIn PDF document text
    • http://princeverma.in/uploads/files/92673091913.pdfIn PDF document text
    • https://cargobull.cz/res/file/jefitugotononifudewufoto.pdfIn PDF document text
    • http://acril.ru/ufiles/files/33948664752.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160925ea948775---76877034786.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3fde2f68b---24719805710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=to+overthrow+a+leaderPDF 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_off0000afbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBB 14824 bytes
SHA-256: 6d1a9e81408388be48b82bcfd52b455c6f44326203c21adf7bbe95ced26859b9
font_01_sfnt_off0000d4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 10096 bytes
SHA-256: ca276a3ce29349321b8f1062b2e1a1282fb8e74d1273c6886e2a1b7740da6efd

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