Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d779b66c97a8ad…

MALICIOUS

PDF

79.8 KB Created: 2021-09-15 22:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02325f7d4e6c6a94a83f03ecb74c1bbe SHA-1: e956263fbf3ff60c0bde1df1a5dfe0e4b9d78685 SHA-256: 40d779b66c97a8ad254d5b6e21e4e06266c552f3fa84a1b0b5491e7c69fbecf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=james+stewart+calculus+7th+edition+solutions+pdf+free+download PDF link annotation
    • http://www.adarshvidhyasankul.org/userfilesfile/53828460989.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/5b7c677ec92928644f37f633099d8003/5542404529.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/52555458583.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3c55eec2---polanasijorabuzuxi.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0cbf5a780---juvadofefav.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/31893867103.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/28591454967.pdfIn PDF document text
    • https://paperland.bg/uploads/file/26885261108.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/21074978864.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/51608108249.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/nopatiwej.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/42694612386.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109130948034096.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/muridorobiduxojim.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/roverokejimeg.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/86753373901.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/namiwilogol.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/guwexabafuxov.pdfIn PDF document text
    • http://eternoohydro.com/d/files/93294953388.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/tafig.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/sofunowevusuwirejenagofat.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/47434380103.pdfIn PDF document text
    • https://partnermind.cz/images/files/71165470718.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_off0000d118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD118 17600 bytes
SHA-256: 907a427473009871641fd5e926b9951cc826eb87d020e1936ef6b962b58e0306
font_01_sfnt_off0000fec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC9 11112 bytes
SHA-256: a816fbe22e6595968bd4ce2e4a5918aa094652e7217c4b43bc7b367998268f46
font_02_sfnt_off00011899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1