Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a4a5f35e00ee64…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 21:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d9865792d55979e7384b0ca2c2d6c8a4 SHA-1: 845a477553b61cd61f1a327c3b20e1c5ccbf2eb5 SHA-256: 85a4a5f35e00ee64311e8fb55b1fd440f6bc29a58be762953d3ddaee2d487484
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://10kshot.com/customerinterview/ckfinder/userfiles/files/51583470863.pdf In PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0405f1f15---50626862055.pdfIn PDF document text
    • https://dacola.com/upload/files/bejekawilobev.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/milokededolis.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cf94cbb92---mokujuwulurotiluladeli.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0d96d3554---89735004905.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/lamimominexujurazolokuxix.pdfIn PDF document text
    • https://led7.ru/file/66592446999.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/zekosanox.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16082975cd1c6f---58233843397.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/75135982777.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/sarolitepu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b08f8a789e1---81492940947.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/32996957684.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/16999586871.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/12704367398.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67e90cb74---91547214376.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/42022621061.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/jojekogun.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/zewexisuki.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/33925368462.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/10703688868.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/wisero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+meaning+of+palatialPDF 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_off0000d87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87A 22192 bytes
SHA-256: 0c711fedcb54c6787520237522d0a7756608adc17148463cfdab6c2e441a4c53
font_01_sfnt_off00011083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001289a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289A 10500 bytes
SHA-256: 29c3f86811df3d36b5c83f0a8e83dc7b2fa545246a884d5f1986ab4ddf0f27ae

Open this report in the interactive analyzer, or submit your own file for analysis.