Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e3249ddea36e82…

MALICIOUS

PDF

88.4 KB Created: 2021-07-02 10:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 890acb1a7a03357e793c63bf8c5198d4 SHA-1: 42c1719dfe2c93c316b667c224c5f7a02ea1b1cc SHA-256: b9e3249ddea36e82978a812baf72e4be4924d1b6c439f8b370427cde1a561fef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains. This suggests the primary purpose is to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://garglob.ru/uplcv?utm_term=charlene+on+the+andy+griffith+show
    • http://tz5168.com/uploadfile/image/2021/05/13/file/20210513_124259_199.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/48bqv24m67ed6oiumka7hpjpjl/gajakewiratevepa.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607434ce01601---15225291745.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609314286cd1c---redafel.pdf
    • https://muguet.fr/sites/default/files/file/51156890904.pdf
    • https://samngaimarble.com/html_upload/file/74981474122.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160787a0589ca0---dalebuveke.pdf
    • http://inarchengineering.it/userfiles/files/99594293817.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b89d89a3a8---52831748607.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc106aaf56---6395531031.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/bg4pmq0bjfld3u07ro5ffggla6/161620726.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/39e41be96636c39b539626f3748d9402/17760475316.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecad9e549b---nodivepikifagibisilew.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/21504ec95bc252c823bceda7b13e9e38/24075371010.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af54cea1fef---46953103274.pdf
    • https://mmszke.hu/files/file/527429061.pdf
    • https://majubesar.info/contents//files/23509803464.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e67da6260e---bifiw.pdf
    • http://congtyvima.com/images/Download/12127510893.pdf
    • http://softwarefactory.nl/images/file/49957197731.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a787253674c---10039415375.pdf
    • http://all-pass.com/folder/editor/file/86141942682.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e84c1444b7---leger.pdf
    • http://romangruszecki.com/uploaded/file/mofugugirakor.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f698.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 16792 bytes
font_01_sfnt_off00010eaf.bin
91b79769827c9a20ad6aa5e9434d7c7c0edbce940d59d7c329c226fd10e335f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAF 10864 bytes
font_02_sfnt_off00012797.bin
3fe8e89a9a65326053de91acf21fcd45fc0a153a39cb947a3f741673f0733a61
pdf-font-stream PDF embedded font (sfnt) at offset 0x12797 17216 bytes