Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4bd91d3b76b8ed…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 21:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17833133cf6a755f52241503afa453c7 SHA-1: 55be78de49b777a344835bfb9e6aaf41a618a496 SHA-256: dc4bd91d3b76b8ed52b1558c9a298d74d4649931b161e006424b34264cc2aab1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. It also features numerous external links, including one pointing to a raw IP address, suggesting an attempt to redirect the user to malicious content or download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16135f3c59ab26---fidukinu.pdf In PDF document text
    • https://sabresources.com/FCKuploads/file/tujigukawilitavazi.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/f10i45q0lco4lej2dverpe3opb/dufov.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1d8605b7c---fevogunolipejevep.pdfPDF link annotation
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/02o6hc9smffhvsnb54t0ka8ri3/55526565430.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/jarevuzo.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/76872679107.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/duzobid.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132d58f70da5---53768423838.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/fawafika.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/dabasudapuvefi.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/sixabarawugadowurusiz.pdfIn PDF document text
    • http://zgic.ru/!upload/files/puniwezowupifitisa.pdfIn PDF document text
    • http://rjt1.org/upload/files/purevanewadejafov.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/muvixadapesap.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16134605ce1d86---bizifod.pdfIn PDF document text
    • https://thepainter.asia/upload/files/desatakilazujilunajo.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161487e77db2a2---27693640301.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/jojevawerogisomi.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/luwubozelevoselamoz.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132c73a6ef1c---450168156.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/bidow.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/vuxilalupoben.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=tamil+pdf+world+novelsPDF 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_off0000b408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB408 16272 bytes
SHA-256: 1092f799ac680970f81a51dd795354254316945ca5e2546024fd8ab373a40346
font_01_sfnt_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 10676 bytes
SHA-256: 3c910081f62d65c3fab0675d1cbc3d6ace57307b811f3a3969b78bce5c0b8d90
font_02_sfnt_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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