Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb455c5b052bf6c…

MALICIOUS

PDF

71.0 KB Created: 2021-09-06 08:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48e3c08924e1403aec1a40ab29d2fe3b SHA-1: 464504d37a427492cc16e21cb1ce9b1d6f990749 SHA-256: 9eb455c5b052bf6c78b1a1101f810df217cc6ac3cf7af5b51e66911e93dc52a9
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting domains. The heuristic firings indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://dabaizhongxue.com/upload_fck/file/2021-5-21/20210521231558581042.pdf In PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077dbab58a73---nujorisejepexo.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/kobozivipukomefizide.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/3580102721.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/81099710004.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/gavowilasivu.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/032a7512f5cba55c03f7eb44eb8abaa4/74844009570.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/56731898300.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/vaderomulurumirinajowo.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/515e5a5a16155643128db6d18bf5199d/lusagojudebevezepufef.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/fevupoxotofevimexezur.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d9727f0d8---75779633639.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070473b4f91e---27274332476.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210527_86A87C28B95DB159.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071db4ae4283---jorovowubilumotis.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60F481D80D574.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/dipubav.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/4f5c49a2cde3678e47dc8b975b79fde5/11763600929.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/3083ad4adfff9e05e172b201caaf4eb5/zexixojadevi.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/95045393.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/witoxema.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/30037606571.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/uj3kqmq9cv4da1nde0j78lkub8/mepodifubupuvalosaki.pdfIn PDF document text
    • http://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/98500148340.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/42235475279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=p+nikitin+manual+de+economia+politica+pdfPDF 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_off0000b5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCC 10704 bytes
SHA-256: 091eac7889957a4669009fc463dc8f5a1ba0484b9cacc5e70f537bd68d24c033
font_02_sfnt_off0000e645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE645 15860 bytes
SHA-256: a1ca07ab9941265b630d37b92ee80be0ba7fe8d538cfeb9f0d564c106fe6c9b6

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