Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd85e3abcf90b0f7…

MALICIOUS

PDF

72.0 KB Created: 2021-06-11 19:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57637d249690b5be6845bb58a3ac111f SHA-1: 855ae3199b596aa1b59e82fa7a1b6f845ee8e55d SHA-256: dd85e3abcf90b0f7ac9ed2c93790df5f1f07780821102af5ad3ab253f5860e67
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pistant.ru/uplcv?utm_term=codes+for+dual+wield+zombie+strike
    • http://aftckwt.com/uploads/file/52519052242.pdf
    • https://kisikana.hr/userfiles/file/bigozusurineveputunikele.pdf
    • http://gorisum.net/fckeditor/upload_file/file/55428582545.pdf
    • http://arci-mp.fr/admin/File/15563057330.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/r1qgs80irf0s787ehjhv497u3n/paxaganabe.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fdd72e4ab---tisavimadajivumesonodabu.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/5e7655cbf89e02fe0db6c1aba3565486/35993262742.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fad0c3b0ea---3894284925.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d0d78a8815de86cb89511da525f3a761/4502096954.pdf
    • http://www.zywawiara.pl/pliki/76771766436.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a208f8a244b---gonoreneputazugupufuvav.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5a1f1542d---98675477111.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ce8da5fe---19216855548.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ec67d89f7de2108043f44743bfcff5fa/murokuxupukogolelovidax.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/05b3bdee0b88c11a151676bee49bfc41/60304208992.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca39571617---41159046731.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df75.bin
34c079ab6fc717118c07f6d22ea0c78367e2cbb1d7d6575b1741ed65db26f9a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 5304 bytes
font_01_sfnt_off0000f182.bin
cc6d4ded480664745a22937499c313c7069ae0be177690f32b41cf22ab219a2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF182 10456 bytes

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