Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b935045053015e…

MALICIOUS

PDF

81.5 KB Created: 2021-08-26 05:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 03e27c1bfc8fec9fc9462950bd897ad0 SHA-1: 2fb30b0d47acf708740718d3f7cce135d2e6ec82 SHA-256: 55b935045053015e1c6ef42075404587a329354a510a5d5f898ceb94a8f0534b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters indicate a coordinated effort for SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/mdo0o9p6q17s3ammiu3rbgaqg6/1753441182.pdf In PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/3206d084c585d69e4c87862298d4e3f8/gozedabovuvewaro.pdfIn PDF document text
    • http://inse.us/uploads/images//files/fesagozorogavarulivufel.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/0jamnk11r4t4h9h65hc10vip1h/pifojaxikileragosikekufof.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/qbje5h4qihasuma471dsq90p9n/8991188457.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/76706729464.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/885a3596503833424ee956479064cb41/36559756404.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/19030108716.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/wakolulutapobe.pdfIn PDF document text
    • http://a-pluset.com/userfiles/12108445656.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/rilenineti.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/zuzusolavovaxedavotefufod.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd475eb9b---fulizaduwafejasojomaw.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/81974711148.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/epfti57j5jc9qv52251o22mrc3/minogexe.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/muzibizav.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b164a13e4fb---49196639531.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/vuzekapudas.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/wupakigowonis.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/693ba110ff508a82c873dc882727ff9f/milif.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/p6av4us7n3a365l8rrebh3ni70/94101339563.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/39272338487.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/zuvamevix.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/3cbeb1218dfa9b7455af2dcf9c116992/gemagadogoratutuj.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a107ad4bc---vuzuvigokesemadik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=stick+shadow+unlimited+moneyPDF 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_off0000d8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 11000 bytes
SHA-256: 2461dab36ba7da815f6956400e1cbcb0611e81dce415471bb01da66b0b8dcaf5
font_01_sfnt_off0000f21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 17172 bytes
SHA-256: 4a9109a968335eddcbb4fbf7e359bf4b835a8b4020784bb93c9dacb794dd31e8
font_02_sfnt_off00011f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1