Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2d088aa0ebeedb…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 15:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0451688627f581fd19a1f197ff6b0277 SHA-1: 91ccc6be47b2a297869b6303c6d82fda2c93ee03 SHA-256: ff2d088aa0ebeedb9b65f6f56835170c8e4be21c06d04e8accf7d1f1bbdce4ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://teplorium.su/userfiles/file/latarufu.pdf In PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160735103de291---28954659028.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430162828106597.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/zekatenotajelu.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/30/file/20210530_190555_173.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/50670065344.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/dizefuvunuxiwifam.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/jaloxora.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/85180781282c3e029a4c7e244de8536d/13882421693.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/94468147562.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/gozodu.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/66398625421.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/bakodalelivepimu.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/biwaganejosi.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/74993538586.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97592ee2a---52405112472.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/95516217975.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/xijipuziwunopavu.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/tonobagalawerenuraz.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79f20b52e6---30254635201.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/xapudenufexusukos.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wikojasarinutevulexani.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b20138ad368---fimigiredodajuxunaloxev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=les+accords+du+piano+gospel+pdfPDF link annotation
    • 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_off0000dd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0C 19664 bytes
SHA-256: a29af15d93b61798da94e64ccbff3cdc9aefdc0a0ce88387610ff90488cbb2d6
font_01_sfnt_off0001112b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12942 10752 bytes
SHA-256: 9fc817f3e6e9005eb2b720957f309f6fb45db50ec011484ff5a9600c856b84d1

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