Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09235532dddfc0d…

MALICIOUS

PDF

78.2 KB Created: 2021-09-15 18:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99665da676e9e8ae7d15b997079e9e4d SHA-1: 4e4d8379e51b73c7b879a239ce7dec4a81390dbe SHA-256: d09235532dddfc0d38a769823a6579b25ce939e53463649626f3ba4aba6f4427
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://mygotour.com/FileData/ckfinder/files/20210913_908830581B70161B.pdf In PDF document text
    • http://insightonafrica.in/userfiles/file/44941551478.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8b749293---gofabepomafeguz.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/bc8b408ce6a6bd09264035a9679f853b/52708119820.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d81c268e87---fobimozomedetewozowov.pdfIn PDF document text
    • https://nistd.in/userfiles/file/80315122158.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/10218117630.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/21363650124.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/tumewiboveseda.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/wugagepunegogawanusew.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/vosazuradebefitag.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9bc60e58d81ec2cd0f0f408b75177d75/47362545421.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/jirifisoxopema.pdfIn PDF document text
    • http://rvhifi.cz/files/file/68545424823.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/teluxuk.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/48459156538.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vaprke3bnnsngrepubn77dipk2/rarezig.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/jikepusonixalofuselonigo.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/38043247715.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/72502754940.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/wukene.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/butesonuzinokoza.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/rivokosokoxupisemoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=summary+of+the+beautyful+ones+are+not+yet+born+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_off0000cbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE8 17424 bytes
SHA-256: 8ea3cfcf6a93f9f4dfaaed618e5b0d6a85a956b222fdb65a7a9915c36ff802da
font_01_sfnt_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 11100 bytes
SHA-256: eb3c1948f4a6af66a6dcab3643e6f882214e39786ef4fba16d7567079a2cdcc6
font_02_sfnt_off00011250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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