Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d0ee870badcddd…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 13:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee6d4b69979c76e6c872834a78d9919c SHA-1: 23f246aba386c7e78a9fed5230a3874dce4b11fa SHA-256: 63d0ee870badcddd9a191123c12d6840d5768cb604dbf56d4d3ab5f0c89d7dfc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to execute the embedded JavaScript, which in turn likely leads to further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nusbetaja2.com/contents/files/32340386569.pdf In PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/xadepaxiz.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210917_1C033703B97D6574.pdfIn PDF document text
    • http://17njl.com/userfiles/files/kagiz.pdfIn PDF document text
    • https://digireg.nz/upload/8929400173.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/75673428007.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/48761272384.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/limujalewiwofi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16132f0f3c1f7b---gigotudilubova.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/fatirivit.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/liposekelukorazefiruj.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c01e6023b---vibufolemukavubi.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/marusodufox.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/kizokitonudobujojexokogok.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/jusozija.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/62949001825.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/getukufedep.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/vobarevi.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/67079819323.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/8651119893.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/41723936293.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/6774960634.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeae5bb70f---nolidanel.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/jixasidinimifuxobolajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=callx+apk+old+versionPDF 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_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 10580 bytes
SHA-256: 4312e9b77d928801ed724144c1eb83d8457e2f99405ac5f15dddadc2c5d4692e
font_01_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 19484 bytes
SHA-256: edea52d91855b92a215c3ba72b3ad542b0d208417399c6fea02b66483eca48c9
font_02_sfnt_off0001303d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.