Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea7487c57ea83ea…

MALICIOUS

PDF

89.0 KB Created: 2021-09-15 11:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b1de9959d5bbd7018c26af513db4ea76 SHA-1: ee8bbf8113fec9971f1729097dfe2a2a5c98bbcf SHA-256: 9ea7487c57ea83ea135e55c7085c0c4f47b16c3c08d616bbdded42194e31b8fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and the overall structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=beste+barcode+app+f%C3%BCr+android PDF link annotation
    • http://yushendesign.com/images_fck/file/1630517542.pdfIn PDF document text
    • https://webhosting4.net/media/file/58027760598.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/gezedarijezikuzaw.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/zurinugejuwo.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4ed5390a3---33177547286.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/luregixav.pdfIn PDF document text
    • http://4darchitecture.org/img/all/24199970856.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/42823143522.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/59680220127.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161330f0195be6---27589032746.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/81690573433.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/koruvavapasuliburipiv.pdfIn PDF document text
    • http://hocomesun.com/upload/vaxibepog.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gasekopatobakigoxorevagen.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/laguvaje.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/fugirutulopep.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/54632068387.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f6d8a8f2e---satuwufuguxalasisokumefor.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1631101106/files/luxomirivubujafab.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/tunemuziduwubapes.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/78088551938.pdfIn PDF document text
    • http://195exim.com/datas/files/90068917786.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/49705098010.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_off0000f305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 18896 bytes
SHA-256: 8568dd9a50e049b2ee9aa57280c8b4273ff066e99e4b3617303f3cee726ee28f
font_01_sfnt_off000122f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B10 10952 bytes
SHA-256: 287cc7df181ff19ef3eba372384082ef856f87d898a6d66b56d6d51478cc9eb4