Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f4ae6a9154bdc9…

MALICIOUS

PDF

87.0 KB Created: 2021-08-07 05:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7b00f1b6255f00b7528c38f160d16c91 SHA-1: 59a31b6d9bc6b3730518a0f21c2c74dfae1498d9 SHA-256: c8f4ae6a9154bdc90fff6ce24bcd1805cb9449c7862b401c7db61ea7e9684050
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160712f050aefb---75670989571.pdf In PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872cf886ed5---rotidijonewexexo.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/20654940174.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/besis.pdfIn PDF document text
    • http://kag.fr/userfiles/file/medexubivazilaku.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/54710847206.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40665699b5---7305290690.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/48d3f9b205a7155897773e5847fec291/69716378794.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dd87de7c4dd524702b3506dd4a3cba4d/bulifanokisutojagej.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/80534454003.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/3f1dfec338fde0b9fddf0295e37e1322/61000252159.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/tuperuxifanolemasasisepe.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/30165966814.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/rojavotef.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/gavaziberajemerilaxeli.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/zaxukijuduzisenametosud.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079abe2f0f1c---fujawomilewonovinu.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/36d8723876d87cc8d8a4de459b0ab687/79482952763.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/vijela.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/79fdd9a1a5b28bab64bb2fbd5fa8783c/44840525543.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/zalusebexodugagalutini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+is+manual+mode+on+instant+pot+ultraPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/lebotopaxabodiwusosa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#Referenced by PDF JavaScript
    • http://purl.org/dc/elements/1.1/Referenced by PDF JavaScript
    • http://ns.adobe.com/pdf/1.3/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/mm/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/rights/Referenced by PDF JavaScript
    • 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_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 17372 bytes
SHA-256: 27481bcd49abceefdbb57488a763e2290799dad06fe27095559eebbf79b118f2
font_01_sfnt_off00011d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D56 10748 bytes
SHA-256: f12478fec7f6f98d84275dec1da01df5e149f3e6774609dac4a15a783e952af1
font_02_sfnt_off000135d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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