Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b18b515bc2c22c5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 09:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: afc28b56b5fe49fb30eee62d341ce59c SHA-1: f6b52245dd721b3be5e91b762beae6773705309e SHA-256: 2b18b515bc2c22c5dc1bec8fa6914a601459e96de60cbdfe5d37f27f482e7541
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

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://irlanc.ru/uplcv?utm_term=patofisiologi+kolangitis+pdf PDF link annotation
    • http://inistor.com/ufiles/files/juwirazeje.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/liluwawasagosapimulo.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c4d22697b---97511914958.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/salogiwagexaxesi.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/e3fbb18d8eca387e72b8c37b349f8f40/95342641969.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/98947949942.pdfIn PDF document text
    • http://pandoreunion.com/clients/81456/File/wosofaxaloponipov.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71936060744.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/52367974177.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/8e0b846496d404c32a58246e480dcb52/paxirifajikokuvoda.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160876ca29c4f0---52288509077.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/96fb1ad0e0e3b7a2db156692aaa35244/givador.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bdbdb5732a---kezamus.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ohvj0t1jab3nr7sd4n8otlkf8k/130148222.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/begenenamavogid.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a8cd7cca26c8fae301abee71d4240efb/58641079654.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/2107220107502518334slos.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/aedfe1f79b6e50134a529b2d32e19374/39748736858.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/41673679050.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/fakopesuwadolisebamese.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/xetewa.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/53595920140.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_off0000d80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 10532 bytes
SHA-256: 75d2f040335670770c1e4012cca108a25eb0c29a4372e71384f4a04ab88ad8b9
font_01_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 17996 bytes
SHA-256: cbb8d4289be6ffe2e278f3ef36b18b674235aa451d8cc24bdfe059bc47959b7b
font_02_sfnt_off00011ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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