Malicious PDF — malware analysis report

Static analysis result for SHA-256 8983d4b441f840ea…

MALICIOUS

PDF

73.2 KB Created: 2021-09-01 02:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef7416b4f8086909fbdc7b37a14a87aa SHA-1: 97089b60ea400757302e4551f1ffb14ea93da1d8 SHA-256: 8983d4b441f840ea94b8270ee0fc286d3ca0e0a854a7803efc007d53d88ba7ff
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains numerous links pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The presence of these links indicates an attempt to redirect the user to potentially harmful external sites.

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 http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5b8668ce1---13718684388.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c31e2c25896---punugufagatilebulebati.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16080e7bd9ffa1---28380860738.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/dejifedetoviwiremakewoked.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/fe251c446bc579385e46c7d2eee38961/panodadu.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/43057354395.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae271e930f7---39393292877.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/b8qh7fivbn0a93cbn0avgij188/62528253733.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079b6651cadc---tugezoxivoxadexizuvapedej.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210615093136.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f0fde0b66d6---62517508809.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/18761d57c255f3c85d5a703feb932997/46109927472.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zafesobuni.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/65572094765.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/solofet.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/sikileregolekefopoworug.pdfIn PDF document text
    • http://headrepublic.pl/images/files/volirixuruwi.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f76809d227f3b4bb3247f0e1ccb304f8/87227951906.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/wevuberivim.pdfIn PDF document text
    • http://sun-tes.ru/files/file/67377208704.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/62577768474.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/94360787318.pdfIn PDF document text
    • https://vpmemorial.net/images/file/jigumum.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/61380763289.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c4472df2c0b7bb46e7c4164797095911/woxuvizodojopobugan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=post+structuralist+geographyPDF 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_off0000bbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F6 16304 bytes
SHA-256: 6a43926ce40dbdb227dd3970f227deff9dca4c9fd44b0be5d5ae7ccdd516d54b
font_02_sfnt_off0000fdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 10764 bytes
SHA-256: 100d3dfd2bccf1597ffbcfedc6a4e20bcf2868730c5667146b3c04b2412e7066