Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dac8768121cde21…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 09:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3ef5c88dcb0c2a8182e825186fe7d720 SHA-1: 5b4a0cd6532e4f901b9170ab1197ab44c1c41918 SHA-256: 5dac8768121cde21eee3c538eb478029fc3dd2f46dbb68d2792b2088f2c77030
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, suggesting a phishing or malware distribution lure. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=scanned+document+editor+free+online PDF link annotation
    • http://austria-ex.com/images/blog//file/68886947064.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/53242216759.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/61223558775.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c11f1d75ce6f2e188b40d158ae465305/wixanigenevexubotunirawe.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210825/file/16298800848894.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/wanodekewijinulixewu.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/betima.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/tilotomoluk.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0b454a7fdc579fa9e2167d70b452fcdc/96635764690.pdfIn PDF document text
    • https://sealskinz.ru/files/file/17703001963.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/45759235786.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/zedekaxiluzifezilu.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/6422ba490523a4c7a0091c26d82916a1/fowilejojuremom.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c01bd65121---29058825538.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/75526831054.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/33046295951.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/guwufoxatakibinip.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/64815657573.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/bee329faa90dd382fe622d010c75b9f8/12738117624.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/41227630911.pdfIn PDF document text
    • http://funperm.ru/content/file/naluwipeguribase.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/78121640455.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_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 17372 bytes
SHA-256: e5b7fe45bd4b8683799b13a0740c2c7d60cea0d56d241f48726d9bae0fbe3b9b
font_01_sfnt_off0001053f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D56 10644 bytes
SHA-256: 8cd9ba4988e03036f04d20460598b2384e0a3890ecf3b49b868ba44b0f58b0ec