Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a2cf918fdd9488…

MALICIOUS

PDF

71.4 KB Created: 2021-09-28 05:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: de28cb9276e03d8b135b0b957d82f26b SHA-1: 72769d156d97a9040d27fc4ebf0fb975a272d4f4 SHA-256: c5a2cf918fdd9488f54e8bf4747f6ec5743c87ddfe364ac56c0a88b7b21312a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous links pointing to compromised websites, likely designed to host further malicious content or phishing pages. The presence of JavaScript indicates an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=redmi+note+10+pro+max+latest+update PDF link annotation
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161523b920ac28---ropobufupa.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ada9e803405b4aa31a327b636a512f9a/xubulakidulo.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/57655208466.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/vowewebetigejanifa.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/52092205170.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/fakemivatetolanazev.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/40531715763.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/gimowulijevitekotu.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/varubelejurepolugakozojip.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/sukudibor.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0d110d02---1754651212.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/2346495941.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109220150421315.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/zavutokugikup.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6650065b39cd2528c287ba35139d4931/63807730933.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/99685571758.pdfIn PDF document text
    • http://veitali.com/upload/files/saxisuduxum.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/jenunelibotamebivog.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/medufifavetafasipok.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/34413162589.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/gomabe.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/vafaxulagixazodateneji.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/gevajapokewekus.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/27708297652.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/sepitugexajajimip.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_off0000b46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46A 10972 bytes
SHA-256: 0a4e6f4c6c52b7f154766f7470d80350160fe2e9a631ec2c97c000a895d99eb8
font_01_sfnt_off0000cde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 16176 bytes
SHA-256: f39d3845c9c0b0d32e2e886f7b7ead1d39296ccbe409ff91c6f843a4f67976b1