Malicious PDF — malware analysis report

Static analysis result for SHA-256 9635b7df2eada2a3…

MALICIOUS

PDF

85.5 KB Created: 2021-09-11 17:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 885dec4bdaeffeed344bf8b706c47551 SHA-1: fd5c253c470f40bb3e16ed4cd3f140cab57301d0 SHA-256: 9635b7df2eada2a3b41cfe0c48cd2b42d19ddc8832255018aa49fc5af5e9fc6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=what+to+do+when+your+phone+is+not+connecting+to+wifi PDF link annotation
    • https://transdeliveris.lt/userfiles/file/nasejelijoroduli.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/51005691434.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/84642876235.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/denemajusefiwegare.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/22680369163.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/74c9199855c708accce28811e6a24358/wefipabiriwotabajuru.pdfIn PDF document text
    • http://7profi.net/userfiles/file/17521277313.pdfIn PDF document text
    • https://buka.ru/sadm_files/90337160474.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/87476075551.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/putukunugi.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/32285586117.pdfIn PDF document text
    • http://yuha.be/_files/file/ruzirawalaw.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/loxegovimatadit.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab740981e---gajifizovelowiru.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/6471623319.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/88901301265.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/jiwobuvaguju.pdfIn PDF document text
    • http://esteel.my/userfiles/file/83120529470.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/posoduvufi.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94c375239---vililufudaworokomemixo.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/kesifozawuxes.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/12403847764.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/34608966413.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/bisikurolopafuwuvevo.pdfIn PDF document text
    • http://anninh247.info/upload/files/10017396698.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_off0000e6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B9 18020 bytes
SHA-256: 019550b6485382d2cfb4f326cf7f65a04eea334805ee555d026c354306de3f3b
font_01_sfnt_off000115e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E3 11148 bytes
SHA-256: e1a2a35ba5d977fdf2ab0f858f2b5c4a9e4b2e00d06fc5e56975aa68968f0569
font_02_sfnt_off00012fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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