Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29b748fcf80864f…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 19:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6a7692bba156eb8e5cc54f3cd651e350 SHA-1: 3ae6adae6d161d7a5ee10e8aecdf595dc2995269 SHA-256: d29b748fcf80864fb56d0b96c8ff250ef15ee2e15ee18bf516f904a473650616
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress uploads, further indicates a malicious intent to distribute or phish. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://www.chatanakonci.cz/userfiles/file/paxitejoxadimiw.pdf In PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/dobugevovotulaveduzew.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/ketoz.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/89422909397.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a66b3a733c---dujuzerojelo.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/54457666605.pdfIn PDF document text
    • http://enricobarraco.com/files/74474129845.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/89550153177.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/17071629132.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/59773394456.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210907153110.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16140130d6f042---donolomefi.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/koluvobanijas.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/vunibur.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/47743952399.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/0c80a9046b0fb8608ab2cc9e312abae9/poretene.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/86537181684.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/25256679959.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/fozuduwisizaxazu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145149d19938---batakol.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/xutodesurilerebisuwodafav.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109100431281803.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/4961019737.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/jobaworaxexuduka.pdfIn PDF document text
    • http://savemaxint.com/files/file/48532092938.pdfIn PDF document text
    • https://servauto.fr/img/user/file/midudun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dream+league+soccer+2020+apk+and+obb+downloadPDF 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_off0000bba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA4 11328 bytes
SHA-256: aeaeeca3d66465cb0052e49797997d008a88d889756a09caeb43ad397d7efc78
font_01_sfnt_off0000d5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EF 17104 bytes
SHA-256: 2ff5ddd7336e6c0a8feb6c25d1ea010edd0d49f346e27baea11e3d5e39ea3668
font_02_sfnt_off000101fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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