Malicious PDF — malware analysis report

Static analysis result for SHA-256 404d28efd290bbe9…

MALICIOUS

PDF

82.8 KB Created: 2021-08-16 21:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c0135880911be6e5ab96957757c028d SHA-1: 6546e0f280b314693c6ccd72578afa1bd7a11343 SHA-256: 404d28efd290bbe905c78bdba68a17f62fe9f8e53995c3f04c59e8187c2b59ec
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term_redirector=True' further indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4fe41566d---gozalesefen.pdf In PDF document text
    • http://al-bandak.com/userfiles/file/wegogamasavufinow.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/vojodijizuxovoxe.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/44201624898.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/78378116697.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/vixadozafivijixareb.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9150763028---pesajexel.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/limilub.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57f9022c1---kezitetugo.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/3rfmlc1vkn30i5um3vm6nd63g7/87879341679.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160fb1a8fef253---pofatago.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa27614b9f---41788054209.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/363cab8dc66ba4aa566ec99b7396230b/9035809880.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/j1isl4m6mmkndb6d4o7ue9odr1/91375442527.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/67968066268.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3febecf98807821c4579aae2e5b8b9ff/kosolezapuxod.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/maxujoweferidolaviw.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a5242b72---podasevevowoxonavobejakil.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/26710268856.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d3753f795---ladaxamifagogonutojiziri.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/9f74b86c8bd6ce35bdcbed6d7bac6857/25070228424.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076d8a59a357---66946212255.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/22997388614.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/15724973127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+the+job+of+a+geotechnical+engineerPDF 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_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 10880 bytes
SHA-256: 63fcc8e4dfa7a6d30e35ccfa44fc5a91d12f40131656bb89820b9f3786c0601c
font_02_sfnt_off00010ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFE 17148 bytes
SHA-256: 0116f28a63fd39d618028e5255c8720fd500df5dea25c252651df7717a5edefe