Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb9e15a983d4c5c…

MALICIOUS

PDF

147.9 KB Created: 2021-09-07 05:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca7889bc9250a1eae4a2e879b0204c9d SHA-1: 0c6fe0b15ca7faa9302a2d9cf828d8056ac49059 SHA-256: 4eb9e15a983d4c5cabbcdd7c01419e8a2fce05e1aac0e7717d66db7e2d6292bb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains a link farm pointing to other PDFs hosted on compromised or disposable domains. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a strong likelihood of this document being used as a lure to direct users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://luyenthitoeic.info/userfiles/file/8024696019.pdf In PDF document text
    • http://naszymsladem.pl/upload/file/82977009716.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/fubixinifatokufem.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/kukidewemede.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc2cce6ce1c48c92c8e65a32ccc65cd0/jalanuxuk.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/61319815130.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/5eb565099f793805c496148f1f450bc6/metarekokanoxuda.pdfIn PDF document text
    • https://onecre.com/images/content/files/71906392159.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/66065486174.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d8d5e206---lezejidumakek.pdfIn PDF document text
    • http://esistore.de/userfiles/file/40600616950.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210630_96C7A8FB8E8A446C.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/38086554247.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/99988610616.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111d776d1dee---konuko.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/watelinalugadolesu.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/damukidizugepaxid.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdedf354a81---davukit.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/54fd741b841407431f3af573245546d1/33728495983.pdfIn PDF document text
    • https://music-group-store.com/upload/files/82067799339.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/mamefudinepisukabapi.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/regiru.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e33523c4224d803d2ad69c687ee7f8f3/wiguxoxivurapozesujug.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38a8bce966---welalofitesogoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=financial+accounting+ifrs+9th+edition+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_off0001dde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5F8 19016 bytes
SHA-256: b67bbd91e7f19c0579ab66eebc57f9ccaa3006f12fb128932cdbba02d6859287
font_02_sfnt_off00022777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22777 11144 bytes
SHA-256: d2bc11769396efc75d44562089602a025dbea6c6e7d232c214be155f7226fbcc

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