Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c6cfb13c0fb905…

MALICIOUS

PDF

90.6 KB Created: 2021-09-02 11:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 78fab939e0c054c08c23ff0907c4a591 SHA-1: faa4a5f4338690fc2348a57624f169c77c9c7dec SHA-256: b3c6cfb13c0fb9051c781f3b9564875e5a1cce64fad30143c6ce177abca1af5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. Several of these links point to compromised WordPress installations, increasing the risk of users being led to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=rosario+dela+preciosa+sangre+de+cristo+para+imprimir+pdf PDF link annotation
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16072a4df77b5c---piziziju.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/kimabujapowewusejeje.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16116a4e195b99---laraz.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/acaa3012eb51f665fd8f38c1a33ffeee/82740136025.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f99d2aee4---36159149789.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/i92k8qmpfus660kimvds640k2l/tukolaluzij.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210804024152.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842ee226caa---wazomeval.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/silofe.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/75464235959.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/73811532235.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/21253535396.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/noxomade.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b28a2678e8a1332ba03417f02d6ab0c0/baxojibarokolaxoxetak.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-8-21/20210821051540836375.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/67107701609.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4f19f3563863a8234d1737b1e4d5b85/55826137071.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/95244330491.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b54f5d18a50---3451945140.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/06f5525c3d82e7c31773c98fe85287cf/rurajisasunedozitewanevol.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/528467b30ec35fd7343d44ee2d9c9892/60642728548.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/77217418864.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202107071329417738.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/xoxisokera.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_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 20168 bytes
SHA-256: 41be9141ee11bcf9e850fc30953a883ea6f7e0a45a50c48b758fa9c1371bff18
font_01_sfnt_off00012ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC9 11008 bytes
SHA-256: e972705f494af4decceb84002e53f8df49547a701e0460df5c1f22216a88e85d
font_02_sfnt_off00014422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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