Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcbe56c22511744…

MALICIOUS

PDF

86.7 KB Created: 2021-06-26 08:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7fcfcc62440b556f4a43b458b48aac66 SHA-1: f7e668d3f88ce3f44adfa68f21390a9515fff24b SHA-256: 8bcbe56c22511744f2d559dd18ec6a0ff6f59849ae7593697898851b711aa199
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites hosting PDF files. This suggests the document functions as a link farm, likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a03ae908791---vizuxiburodizax.pdf In PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/697f1da0874cac2218750289cb076f74/2859812323.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/92860673223.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc85262277---raremawukujevojarojupa.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/2978e233f0a137e0e130057ba2d36ecd/pefukabupixoje.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b094d87bfe324a20292dd88a3edeba82/nerox.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aba718b0a68---19377209842.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5ad311966---62309495766.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/tozidobofugikunebeludevaf.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/wovugudegodokudar.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f14d0388b---gakonoletov.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/750d27ea2e30e173e337090dae33e956/diluxedasome.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830bd686d09---28388005199.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/lbkp6th074jfc7g72upe12r3s6/defedirukipaduma.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/je1jt3q0omdq48ri7mu6oop4db/60879985293.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/53191604249.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/tajisezeruduzutasavomoko.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa3299c9c---98003110265.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/g732o1et7v7t1r2j17ct374ak1/vinolelevolapukiwezelef.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/46194679113.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/zewizefekapol.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761a9e5a812---mapikibebus.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/pogowomoruxoxen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+does+buying+stock+through+cash+app+workPDF 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_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 11268 bytes
SHA-256: e2bcb6f1f75d4dcf760cb8dc6d13d53f133eae07fdec6f962180de5ca90a31c0
font_01_sfnt_off00010789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10789 16860 bytes
SHA-256: 5d764ff6811dc9c3c08d870e152cad1e20cd7f93eacc7a22cd58b265d7438d2a
font_02_sfnt_off00013380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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