Malicious PDF — malware analysis report

Static analysis result for SHA-256 508184a7d9a4b8dc…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 16:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d59099b16492405bf88410c300faeeaa SHA-1: 40ff4e7430402fc16870b6b8cc74cd2bd6ef148c SHA-256: 508184a7d9a4b8dc003df28df1934e3723a9a09b8ee8929f694c3b793d3413e5
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm and a potential phishing or malicious content delivery mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous embedded URLs, many pointing to compromised WordPress sites, suggest the primary purpose is to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470d4c376b7---55094258823.pdf In PDF document text
    • http://twapp.freshkon.com/upload/files/poxawo.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/rafosiletuwugujudaduleko.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/nazorodetukiluxelu.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090603041816.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/38033888736.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614188629ef58---17011135425.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/jamewobazibosalekozub.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/72448983315.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c0a084a8af6aa9f70333fc02abdf9834/bemaw.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/vebanuvepamowusomo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/svoufd13ph7apfm2fm0r69cvd3/vadidisesuzimegubeta.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/kepapare.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/94571930372.pdfIn PDF document text
    • http://soc-in.com/data/media/files/6599008096.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/16106195061.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/zabuvelofuxesedumawiwi.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/33742712489.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/88512056900.pdfIn PDF document text
    • http://juha.be/_files/file/11625578434.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/tinafavaxevulezuwibowelad.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ef2abf03260f6f94246ffac78a40c4bf/17481155981.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/towilagawipapitu.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/16835218009.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d9269493---81493584181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=screencast+in+mi+tvPDF 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_off0000dc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 10364 bytes
SHA-256: ead925ccaf43da4bb9615b3ce1626f353083365d1243798b598c614a7dcfa5b0
font_01_sfnt_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 18364 bytes
SHA-256: 2f9e5d45d7498109a808875fe17e4a8a53d5824785b8703c7ffe1197b7749a81
font_02_sfnt_off000123c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1