Malicious PDF — malware analysis report

Static analysis result for SHA-256 84821eb810e36a36…

MALICIOUS

PDF

77.3 KB Created: 2021-09-05 07:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b060d5ff5095b5d59fcdaf09dda5ddd9 SHA-1: 08268bb5a0d87a7c143173ab6be1a3af501b6693 SHA-256: 84821eb810e36a36aa0e1d90b122639433aaa00be0209c46ee6cccaf443bcb67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://oniceh.ru/uplcv?utm_term=tilapia+fish+farming+at+home+pdf PDF link annotation
    • http://cuatudongnhatrang.com/uploads/files/kesokazubulunuvipagotumav.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c17ebc8ba68---rezedu.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/dubelagala.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/7581809895.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/felobobojazi.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c90dd746b4c---bozuxazivezujodexuwagov.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021061400414670554.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1af7091d---joxuvufametumolixeji.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/temobanifedenip.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/29573767813.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/91683153994.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/tazamuvafix.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/31955399255.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/78801721302.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/88143773035.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/60365680620.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a023ac58---14120770780.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210718_AA2D3FAC8CE38C63.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/36247812510.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/51374161494.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/52380560676.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa1b82e9a---29993579423.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40b1145ca---silubizuda.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/30a40bdef060ba4078cfbbcdff5531cb/12075664138.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/648e7b17cedb0dbc617ef33ca5799c09/wewogupupokobamo.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/83583451402.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/2931993450.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_off0000cb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB57 16692 bytes
SHA-256: bfe6ac2fb06816163af5f6a9bbc246d2b6ebb37ffd253e8666585d5e6ebc92b6
font_01_sfnt_off0000f6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 10908 bytes
SHA-256: 2d3918d18aef78539a808e226c6cd40c5762b35aa8313be7f334f4e7269f4cd3
font_02_sfnt_off00010f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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