Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8964d445485b84d…

MALICIOUS

PDF

101.9 KB Created: 2021-07-08 05:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4ccca1294976d43a9c6ff80cfbd702f4 SHA-1: 66bda824b7cc72b25f48290f68e2c3a82bf651b7 SHA-256: e8964d445485b84d42c29d4a71262bd3f64e817cc7fabf3b18ae5356c4c7f2bb
196 Risk Score

Malware Insights

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

The PDF document contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm for SEO manipulation or to host malicious payloads. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document's content likely instructs the user to install or connect to a remote support tool, a common tactic for social engineering attacks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://tetraeng.it/userfiles/files/bakitamejazigegu.pdf In PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf19aae3a1---zeluberuzisegi.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/g4tpacjj654hvdj022f92c3ac5/93208113899.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/kujodasifogizutama.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba74a3dca---jutebumoxufusepig.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607311b718872---kovogatuxixuvamije.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14ab0e418---bezekudapifoxulani.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/377fbd6dd93c896fbb43f003c14d4bb7/zajafanavenameze.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/u8ejoc4tknme8fqp6680eqm384/wetelejulibupelo.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/ln7t72fo2tkac71rpq8rboe1tp/31050708344.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021052513163330975.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160797f664ffa7---pumipoxer.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/5a9f03c00985babb54290a87405dd92d/nironeketiravidotodigiz.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea0695355---48363771830.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/44645f7f9819556764d30030ae4978fc/71529302272.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/387299371.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4ba541a7a3736c81d86432c396ddfdb6/61320977163.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/cc4b830dd2f1beebb34936b4f6e4dc9e/pekorijom.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/f762aa66168e13fd4f5b5bcc0ce2a7c0/gokeb.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeb9c64cf6---28562947479.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/68342eaa868ed2841a9b9bacdffa159f/polexukomavugereper.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/66497379669.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/puzebitu.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/48314743700.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/bidawileperima.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/50d0cb3c237497a13970ef7a6abc4c06/34479262006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+to+do+in+class+if+you+are+boredPDF 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_off000129bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000141cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CF 17404 bytes
SHA-256: e6160189ab7bde6d28381050dc9ec3fc910db2ab343ff381bc92a9e080220a37
font_02_sfnt_off00016f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F0D 10920 bytes
SHA-256: 7e48d62c1097e8496410b2a7476255c523e680dc254657c80c6b2196fa1bcf54

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