Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26648acaaf2b245…

MALICIOUS

PDF

76.7 KB Created: 2021-09-10 00:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73624295e7e3fe5304d2cc17d68b98db SHA-1: 3c7ef09cdfc0d2055f9b0bc79e0ad820a60155b1 SHA-256: d26648acaaf2b245f921720e6a217f8910fe1ffaf60a4b5f82bf45497889d704
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nomylo.ru/uplcv?utm_term=kakao+webtoon+apk
    • http://scuderia512.com/js/upload/files/bowikusenifat.pdf
    • http://streetnn.ru/data/upload/ck/files/63687411748.pdf
    • https://piauiaqui.com/ckfinder/files/vitakelavarabuxenuzeruj.pdf
    • http://szymonadamczyk.pl/uploads/fck/file/5842071711.pdf
    • https://harkakotony.hu/UserFiles/file/63740193550.pdf
    • http://hvezda-pardubice.cz/files/file/79175877039.pdf
    • https://mvpartners.be/images/uploadedimages/file/75115772214.pdf
    • http://355353.ru/userfiles/file/golowarenot.pdf
    • http://hidramaco.com/files/files/66609829546.pdf
    • https://cooperadora.grupocreartel.com/documentos/archivos/18830602400.pdf
    • https://specialgarden.ro/userfiles/file/nuparukit.pdf
    • http://ahkjt.com/upfile/file/46548232513.pdf
    • http://cityclick.it/userfiles/files/topopuxewibudet.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdaf809a77---nesufozofidovin.pdf
    • http://dxczx.com/ckfinder/userfiles/files/20210909_000728.pdf
    • https://hediyelikhanem.com/calisma2/files/uploads/ralusesowora.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ccf826d60---ropab.pdf
    • https://ans5680.preneed91.com/upload/files/nopazuguwas.pdf
    • http://isleford.com/filespath/files/20210904041455.pdf
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/18741042375.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613a77f736390---97595877695.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f46759295b---xegajizulevorulomomubabez.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c048.bin
a35abd9e5b4b6a9d3a695ec26392a00f99ee9a12db40a8f784e72fc6aaf208ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC048 10148 bytes
font_01_sfnt_off0000d6f1.bin
5fa25c2a49576a9c5c505c86c3c5afdfb5df7fecf7d8df8ccee175a76c447ad6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 20956 bytes
font_02_sfnt_off00010d42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D42 16792 bytes

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