Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a22e1b264959eb…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 10:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 10b370e96d009ef573d9381b013e444c SHA-1: 8e356310461e167b626f4d1a56f7b4cf2bb4c8ba SHA-256: b7a22e1b264959eb34d6a7b12f424b52069727c98b89fdd1067bf0f3f6c2177f
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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://smidgel.ru/uplcv?utm_term=gson+tutorial+android PDF link annotation
    • https://sanaspinler.net/calisma2/files/uploads/dasugukugit.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/kaluf.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a12aa7c38d08c6a0faae7c14b870d3d5/19764036364.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/94019754163.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/zabamakuwofadopiputaf.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090715072973499.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/150914780.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/fatalilumarumuvavixedolo.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/xabuvozajosusobi.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/36020481481.pdfIn PDF document text
    • http://belovosushi.ru/files/95273796700.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/kefurezigiwusenir.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/gagijulivetozel.pdfIn PDF document text
    • http://megalaserasia.com/upload///xobinemupug.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/mejov.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/xakok.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45902685596.pdfIn PDF document text
    • http://195exim.com/datas/files/89841303332.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8615874cfe4ac182f8559d885969f3dd/83941923941.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16146bf9a4da64---19387470516.pdfIn PDF document text
    • http://vhshf.de/File/25619634623.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/jogazulimivopadewobabenaj.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/85485601264.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210908105750.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_off0000d02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02F 10248 bytes
SHA-256: 8407a0e307c02707f4db02f83b8dbb2ab430689fc23f69ceac37ee885618cc03
font_01_sfnt_off0000e750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 18204 bytes
SHA-256: 1ba484a826652197d1891c3325ea3eb83cc089716ba7da359a277c07dafc38a8

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