Malicious PDF — malware analysis report

Static analysis result for SHA-256 4586e4458dcd3fee…

MALICIOUS

PDF

113.9 KB Created: 2021-07-29 20:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6de9ad5e092fdeacca377cf939876f72 SHA-1: 11dc86bd639f13dc050e65dd9a60864c24df1892 SHA-256: 4586e4458dcd3fee84d65dc12d04249f6fae5f71d4593ba7a341e18739b82f7a
156 Risk Score

Malware Insights

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

The PDF sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, presenting numerous URLs that point to various websites, including those hosted on compromised CMS platforms. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://tasarimak.com/ckfinder/userfiles/files/41250224586.pdf In PDF document text
    • https://diphong.com/uploads/58155991035.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773ed216cb8---xurutop.pdfIn PDF document text
    • http://blackshirts1961.com/clients/7/71/7137ee3fbd99c17d296746b31d66a47b/File/49319687998.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a91deddaf71---sojefir.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/42440181841.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcaa5534dd---28961415576.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qull2j6fqvg6isbpk57t9d1trt/87506699633.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/kanesugir.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/53773050709.pdfIn PDF document text
    • https://susta.vn/userfiles/file/zopajokaditanedasa.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/0c2f7f2c4d91a601d306948924c1a7ff/8037086130.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/kititegejoxilobatugadasiw.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/57878796390.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/734500614.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/a9d5sm7rp0erjno9cecn4i66f1/ragigisonulewuduwabi.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/1189533184.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/5b5f77e7de9dea27594cf281a37f01fa/tufijifigotujegavenap.pdfIn PDF document text
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/vijupexenisomezuwuzoga.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e92a2d001---maparazalajawogovamuve.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/56735901397.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802678d1737---28458974261.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/763e8fb6aee0837c3c071ff9f09ab613/lotosukuninef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=evangelio+de+felipe+gnosis+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_off00015f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F50 10524 bytes
SHA-256: 211efb177d45d39c6011d997fa0b479ee9941b9fc3fc5f5e67bac8ce93462079
font_01_sfnt_off00017721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17721 16220 bytes
SHA-256: 17aa6389426bba8544be67898d4b077275dc3b24bdc221998c694ba61cca15a6
font_02_sfnt_off0001a10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A10C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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