Malicious PDF — malware analysis report

Static analysis result for SHA-256 d077ab3c478e74cf…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 05:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31c1b3cbb4c26635fb6ac83aea3fe1f4 SHA-1: 112c04e5278efd12756273535bef4260ec270313 SHA-256: d077ab3c478e74cf6ee6f24e22e2df812b53df567b810416c47548ef70e7a8e8
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The embedded URLs suggest an attempt to distribute further payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aluminiosarla.com/userfiles_arla/files/26752544399.pdf In PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758ef29c421---fexakewixo.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/8562177178.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/87b066d934fe4088023d47bfa6f25386/terunuzudifoguto.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/vedetukisirefuzevetalimiz.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/rukirazipiwitupebefobubul.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/dilujukuruwuputulugazove.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/85370458103.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16118a3ab5df57---fibasipiwetu.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/vabavusenoza.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1612a221bf3577---45751901457.pdfIn PDF document text
    • http://89928386.com/uploads/files/202108301825316809.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210904032052.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210701045438_4rpeoa.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/41666548685.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/neloziwiminakenakalagu.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/neemm6rc7o9b6d040ugeeogd57/tegoxeje.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/fibuz.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072b4fef12a4---94684776933.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/87061145758.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/cp36hdk7acc2i0mgdop6o5r4f5/gadabo.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a169d32b30d---tuguv.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5d628983f---95027729453.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/34793412214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=partitura+para+piano+de+someone+like+you+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_off0000e382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 10964 bytes
SHA-256: adc8146ade9b22cedbf4bbf5702397853a6ce3716064a5e397dd0f1c3ede0445
font_02_sfnt_off0001150d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150D 18216 bytes
SHA-256: dae0bd4a5e89aba70b0a5a7f9d9ff206fcb40667e93e5595c4680f7de9d5bcb4