Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2dc69f1e3ef017…

MALICIOUS

PDF

74.5 KB Created: 2021-06-24 22:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 65953f04e2b554f64d7acde701fd856a SHA-1: e373b5db4bc54151309db78bb5968af5a94a39c5 SHA-256: dd2dc69f1e3ef017b62054636dbb21db2929cff10e43a0abd901b6cd728e7703
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, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The document body itself is heavily obfuscated and contains metadata related to its creation tool, but the primary threat lies in the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a52223d4ade---vujuzulegizikedidovu.pdf In PDF document text
    • http://titadoorbinhduong.com/upload/files/24411619979.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u5teijtr2ib5094teu70bpe7u5/lowovizig.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/23614568984.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aff860ac598---kexixutu.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/32cc41c1c9c8f884ac7fca0daef574c2/25914174356.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fad226cee---suxorogosa.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/banow.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/78c60ba9eaa08499a2313886460ad670/tinazejuvanixukew.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7314ef754---22677155348.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/h1vmvmc314820o6rg0lqcbh586/gorafikugerebijebomeb.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/wosufujemixe.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/vobikumavotavaji.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dbaa4a6a7---megaxulofezujikabamemujur.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/mexiredajefenevuwog.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/pezoloruluwozete.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/narowivitevas.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/oiu44eel0s51h8t1udefdu64sq/86733925293.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=best+toyota+manual+transmissionPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 4984 bytes
SHA-256: 74842699144bac98ffb0331a078e2595bc71c0f6e7423b11ca7fabf6d8d83955
font_01_sfnt_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 10912 bytes
SHA-256: 6c31c9d47778b3776d51e0cf2206949c78a3134c3a658a79fac091cf943b4e1d