Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c6858c71acfae8…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 21:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f63d91de06eddfc0cc8cfebc70ab668b SHA-1: 453cc29d1bc414c4014a7cd2ecb980315c31ab77 SHA-256: c4c6858c71acfae8d3b5f0aacb7ab8fa85ec37a8a6722cdc196554fc5470e42f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133aa80679f5---kodarek.pdf In PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7d97dc15---jomuretol.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/57052584981.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebeb304731---bawodafogobuvisesogefowa.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/40371076336.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/bajijufufamefo.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/14409057863.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612efa06619e0---dujutonugo.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/11873014474.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/todelatavokibige.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/sositasin.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/45442555158.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/vimoduzenumi.pdfIn PDF document text
    • http://xfswchem.com/upload/files/naxikozisosalin.pdfIn PDF document text
    • https://gameclub.by/uploads/files/45859634100.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/korojutitipovebiw.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/5413f7dd1aeb1beffd3a1d66dffafe55/70530046455.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/96948941295.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/30054336588.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/252576488.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/kabokoxomifamopakirap.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/ganajebujug.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/paseluvodon.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/rajolaxutukixamoxerateg.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210908_DD7DB857C2DE3A66.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=quaternary+glaciations+-+extent+and+chronology+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_off0000dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 17980 bytes
SHA-256: 55903c8ee331dee6f0c89b0979abcee04143463e94ba0fbfe867481d774b63cc
font_01_sfnt_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12470 11308 bytes
SHA-256: c208250bff0f6380f6b3b9703c3e61401daf676442e2b72e0f1d7bf59c87b822

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