Malicious PDF — malware analysis report

Static analysis result for SHA-256 055a1dd38095852b…

MALICIOUS

PDF

78.6 KB Created: 2021-09-12 09:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a8c3890626e5ae7dc0df510ae7849423 SHA-1: 2e35018f16808827dfa4e89ba3e025f103a9e4c0 SHA-256: 055a1dd38095852b5694a6a09a0343b640008e8dcda86949621ca59285a6e204
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous embedded URLs, many pointing to potentially compromised CMS uploads or disposable hosting. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. The primary attack pattern involves luring users to click on these links, which likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://singer-island-condos.com/userfiles/files/torotezil.pdf In PDF document text
    • https://m-isc.com/userfiles/file/29358407927.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210907_061403.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/47397363660.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/ferudibabosixil.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/27904148073.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/kowenu.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/dc9f60874a90897bedfff43838cfc7f4/14464811058.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/senesixinipasawupajono.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/loleta.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4e1694e3ed85f40d337cec26d8646889/27770512440.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/jetokepidikubogafeme.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/zudarodu.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/tekebewowuvagorogav.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/66612690035.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/53608279405.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/wezexonozivopipez.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/34728396020.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/727eaff16d19901e6f53e60343de10d2/konufuv.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/lomagijatiwiguwotu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/33571408064.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jv9ua6mjv6t8at9iafbpfve545/22942505059.pdfIn PDF document text
    • https://anup.bo/images/files/68268869655.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8b749293---gofabepomafeguz.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/xajilul.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/12570545162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=11th+class+maths+textbook+pdfPDF 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_off0000cc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC25 18172 bytes
SHA-256: ca30e4e4bf52a8e80c9e0032a54bcc553f3cc96eac3d7ca19fe641923fbd9b19
font_01_sfnt_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 10880 bytes
SHA-256: 8ed0276a9de439e003876dcd812504fca88dcb03e66fa1d258cf6b3b97ffe426