Malicious PDF — malware analysis report

Static analysis result for SHA-256 39035feeff02ce2b…

MALICIOUS

PDF

85.3 KB Created: 2021-09-03 07:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 08a97eb63303c80eefe5752733d13a61 SHA-1: 54816a938670b623df91d10aa0e74eccb2509f72 SHA-256: 39035feeff02ce2b8ead70439ecf182e8d2de0460406f9e5f2ccacd92aa540ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces the attack pattern of using the PDF as a deceptive container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=kerala+beverages+price+list+2018+pdf PDF link annotation
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd5e6665f4---sawesabomir.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/pupulukufefebugixigiti.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/0ca45e1ee8df126b1e4f4c1b82e18421/womipajugejenu.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/widuveje.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/27133718288.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/76611585719.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/dc7c9076f124ac676af8385c06d8cc57/zutiwerusarokof.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/cpprkmcot4sngmmfg5ndalf0k1/75142006822.pdfIn PDF document text
    • http://polkovnik.su/upload/file/wogazudepaxenadu.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/23537611793.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/ginokodugekidabufoze.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/satoronex.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/28531482723.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210619175238.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16078117ef2b25---pamokiwiwifuja.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160909f9c79317---85330705393.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/177bdcdc8323568b2a6b30bdcb0082df/kasenumiburuzexezedin.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/bitaruwiwebikijote.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/jopajidaz.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/5o5o899e6r3co865jb8bvr34lq/3265671966.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/qp0psoqte0fr9ko5623pe7bl21/88040911262.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/pavusuwaromiju.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/bixunopeberiwaxexibovef.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_off0000e420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE420 11268 bytes
SHA-256: 24c2f631244cf56d1ebf56a6b0b78c862b5d1933cf6a331f22f7d24ece672ee8
font_01_sfnt_off0000fe6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6A 18564 bytes
SHA-256: d490ed2b519a6c901157b7e8414238ee622b07df8933c145fa99ec3f0d44f587
font_02_sfnt_off00012f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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