Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40842e821742cb6…

MALICIOUS

PDF

76.3 KB Created: 2021-09-13 20:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b5cb37a9fd0fd0cfe11f4f578a0b4a38 SHA-1: 2475b7055f93ee47ec22cc11cb27c18093e9f96a SHA-256: c40842e821742cb627630acd3b90c41dd90719f14196c75ef848e63aef5f9bc5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://konikanarrowfab.com/ckfinder/userfiles/files/78042052201.pdf In PDF document text
    • http://tauroconsulting.pl/userfiles/file/92048173978.pdfIn PDF document text
    • http://chinahongji.com/d/files/pavovolesawegixakulenepom.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/gefus.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109040805257893.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/4062090233.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/pofenovefenojuso.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/9562964351.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/83910943606.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/kapagatofulidefon.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/92316316394.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/nejajutumifupumisujugifiw.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/80571608611.pdfIn PDF document text
    • http://coffee33.ru/archive/file/xedugirilewizo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b7603cfac---39040968164.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/2741267919.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130afb471c66---48361801218.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613d310481b10---43786714799.pdfPDF link annotation
    • http://ebus.cn/up_file/file/13441879901.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/zolavinozalegupokogevupir.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/rewojoduluwizew.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/90499513366.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/81091005261.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b84dd5664---rowinikiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+convert+apk+file+to+exePDF 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_off0000c439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC439 10644 bytes
SHA-256: 471ba24553a9593d10232548a114683585211b5332d15a5e0465b727902f623f
font_01_sfnt_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 17940 bytes
SHA-256: f64be028f0dd0c0f875dfe467951af61ee88a724bd26e0b8dcd03913e0048dbf

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