Malicious PDF — malware analysis report

Static analysis result for SHA-256 411b16c614327232…

MALICIOUS

PDF

93.4 KB Created: 2021-09-07 18:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0518759ef401ae565e50852cb57037d7 SHA-1: e2097ebbab173cf5cfc181d5e00d80f844aa2f9f SHA-256: 411b16c61432723249718be84ea735fb6fe5c7715ceb36044763f54e0fa7db78
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains an embedded JavaScript stream and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. These URLs are likely used to redirect users to malicious sites or download further payloads, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://inwebjor.ru/uplcv?utm_term=reading+comprehension+for+ibps+po+pdf+download PDF link annotation
    • http://ideviceplus.be/app/webroot/files/userfiles/files/zorunaxubigebefas.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b35b3143e90---gadodafuretitovo.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/62931022918.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/34152174087.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2c3463723---30082749022.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/54940372bd8f16ea8e333dc4db9d967d/50418782203.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/2417455665.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/lugitazuzutuxabavutom.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbdcf26e47---rakivevovubadunu.pdfIn PDF document text
    • http://luckysurface.itweald.com/uploads/files/612a4efdefe07.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/rafol.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928eb0a339c---kezowig.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/dolajarapelanogumet.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f0e6c400c---88780358907.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134631b91847---vorovodenek.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/imc4s5inbq7phiuqfrgrn52hnf/64924380838.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/17321018606.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/33870752207.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/48455901723.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/podaro.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/zazise.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/b9j0tpjobq0c16rli4r867pii5/pimulutadedisogolaboliw.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/95c815573e7088b49bea8292b76bc30c/25027104098.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/xodiveredobajutubedos.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/18555481575.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/kexajigilulosibitetos.pdfIn PDF document text
    • 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_off00010658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10658 18616 bytes
SHA-256: aee72516577f9fa70fe26c3eb59f2e2fbae7d99fe773cdcb0218d9d77607ea50
font_01_sfnt_off000135a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBE 11240 bytes
SHA-256: 073930c2bfb0cfe9d3d568375a248f6eb300f5eb90b7f1cf2f624cd31cafb958

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