Malicious PDF — malware analysis report

Static analysis result for SHA-256 c920077cf51c8020…

MALICIOUS

PDF

79.0 KB Created: 2021-09-08 10:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c294da96fb87de37db2ba936a36d3e58 SHA-1: 567e7f9ddd184bf2e8d051757ce4178b3a87f4a6 SHA-256: c920077cf51c80209878a581b22a05704423ece51c3a1059612490fc2b6b7326
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://extintoresorigen.com/images/editor/mijitijusubunuraganu.pdf In PDF document text
    • http://mygiftltd.com/userfiles/file/77224281905.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e21fac047d---79826371961.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/96800161068.pdfIn PDF document text
    • http://abpaluso.com/upload/file/19003058552.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/62438745456.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b323e8cdb03---23422142503.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/78c140e12595598fad81f66df3c05e40/2503182897.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/45838312698.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df161e48388---korabinegoxatogikaziwil.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfb6ae3250---47025123655.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a41e132d7eb---41812720048.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075f7a6e08d6---dafiwesutoworug.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/mikominokem.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/pekukonexuzorokejipovanar.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/q550pu7knj2gqvsq69qpfcei7p/zujumafenifazaniweniw.pdfIn PDF document text
    • https://termofriz.rs//files/97264147363.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/d2afe6509c4ff5e08cb256fd0e7c867e/7998792585.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/bobipugenotozopizaxir.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/40da876253c9115f73dbc3ade930367e/rodutukakakabalom.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/cl7ujetq3r7ac5vi48khlp18fc/gudazopuzetazavumaniga.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/rudnmrb09tgphihj59e76n0sh4/nizefupuribelu.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/hnj4bjlta00abjta6mudg4ki7c/faxarimudofapumuto.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/wowovijazube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=primate+classification+worksheetPDF 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_off0000cf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF22 10780 bytes
SHA-256: d232e74dbe7169c0accd0778f1cfe73b0159ba393e481943b1b533c57ec3faf4
font_01_sfnt_off0000e7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D5 18088 bytes
SHA-256: e9d2c79486067cc690492cc3cda336574a8cfc9eb939379cb87b901044512e30
font_02_sfnt_off0001161a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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