Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c1c1c81c4089b6…

MALICIOUS

PDF

88.7 KB Created: 2021-09-04 15:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 60ff2f69df4326e2f973f58db261cd64 SHA-1: d4b7f6f654c29e328e6516c2055e762e65fadc53 SHA-256: c8c1c1c81c4089b6fc6ee8ed17243f26276803459c4399688a32d3bded448689
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution attempt. It contains numerous external URIs, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs point towards an attempt to exploit users by directing them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=prosocial+behaviour+pdf PDF link annotation
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d9ce66404---87146427313.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/ace39f3b121e2f3d4b091e52ebb5c6ee/20564315350.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210625_187D6E48CB47AF69.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082baf60b0d1---9084970317.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2edfff1d42---wedajeresujelijuzutipajan.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/1fj13736vmmf0k17sfee7opgkr/53028966830.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b05a0a39f893b843359affb11777dbe9/gowiwuvotowelumegugekasup.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/df62c68d172efcbeffff83e68630f3c0/78159399541.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/girudibafiditonen.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f53c063421---vejovozunexivitaduroli.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/kojilobo.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160989e7ee5b6c---lenexupoxajuroji.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/19242366225.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202108152030541593.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b8351f41d---xilanomomubijulut.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/saduxedevikaziwubeda.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/87b09e67837aebefa11732d7ecaa80a9/18021690083.pdfIn PDF document text
    • http://cocoal.com/uploads/file/54643497634.pdfIn PDF document text
    • https://hsse.cl/files/96601786534.pdfIn PDF document text
    • http://fairview58.org/clients/b/b5/b5cf5456a34e3fefef15e35162a7177a/File/nidomasezalasiv.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/17443822672.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/95307109224.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/3eralrhunmk6gpl2hk2o8t5frj/77279060888.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9536b93f182ffc9156c0b231c2af3d99/rapipaxawupupojebi.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/5be0b8173b7e77d6ff4882e35ea68da4/22364824761.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_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 19100 bytes
SHA-256: eb2667a5c71be4f4a3d3b45b84cf4c86e869ccb5def9d82ac2af082d6e5fe4a9
font_01_sfnt_off000123e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFB 10824 bytes
SHA-256: 770cc330897c71900b471e0f66c7c43dd319ecf53afcb91d45aa3c84ad45085f

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