Malicious PDF — malware analysis report

Static analysis result for SHA-256 29af963c130fd8e1…

MALICIOUS

PDF

77.7 KB Created: 2021-09-15 23:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 62156bd82df9ae87381a1aaec9780c99 SHA-1: 3e31c44b10ea5d25acbf6881cb956eac5e1753a2 SHA-256: 29af963c130fd8e1a2fdb56aaf8cd4d36f37fc92f99f217e44237fcb63d478c1
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 compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c1507cc5af227c0b0d3537f5fe9d2778/74589865857.pdf In PDF document text
    • https://kingwrapcarspa.com/upload/files/9305298438.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/diwajupiwofetanitepezovo.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/82439447823.pdfIn PDF document text
    • http://bscartridge.com/pic/pilawolaramuwoni.pdfIn PDF document text
    • http://state-lithium.com/upload/files/lewab.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16140349406b5d---kukodevep.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/vubezobuwepozi.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/witijesuwakixajagobenideb.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/23696201799.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613423d2c13d4---raxixigevodexaguxavowiz.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa07de32c2---vuxajepukaxidodege.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614226cee6d1e---mijikazob.pdfIn PDF document text
    • http://home-plast.ru/foto/files/wobozejevebusi.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/verotafizobem.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/69742929453.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/77670181812.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/1903370121.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/mafotowesiguroreke.pdfIn PDF document text
    • http://rnralpha.cz/res/file/kebitoda.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/xiwegulalikovifo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d31095dad4---kijawikikevivewokagevosi.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/94449392741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=caller+id+greyed+out+androidPDF 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_off0000c99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99D 18268 bytes
SHA-256: 21d509834cf67811660f3188f555457248a075bfa1f15482835cc6527ea7c4f9
font_01_sfnt_off0000f966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 10500 bytes
SHA-256: 4b37c4f3679679b65f5b2e22fb20f967e375685a99397365707a1f13d85ee318
font_02_sfnt_off00011133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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