Malicious PDF — malware analysis report

Static analysis result for SHA-256 677620b70d9f5561…

MALICIOUS

PDF

85.7 KB Created: 2021-07-18 06:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 3b0096dd3e6159a5fe7fa56279f345b5 SHA-1: 8ebf3e55fa0fead2d2a202fae04fb97774136ba1 SHA-256: 677620b70d9f55615ead41328600c1f257c3162db51b05d84aa9ec96a1f84238
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a35784c88a---32166356134.pdf In PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/87241bff9d35aa1362378544a360784b/53901022449.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ctkcb01jaqmbuueobps5onkik/71760940111.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/39835113337.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/62944285801.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/79671751122.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/e4445ms7i88qhvp9vnivoivfvg/lesagowaduvijepetavune.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/71589478978.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/luponalobukajusadiput.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160912dd01ac3a---73777023515.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/63403880750.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ldjukdsco1bcq7cmflfeoa7vn6/91878664099.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee8cee63b---85517137269.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/rudafaka.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/xowejijemitirawetit.pdfIn PDF document text
    • http://atek-ent.com/upload/file/bojuwuxefisumiroxugusagof.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/refelefofipewane.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2737197126---81804192844.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/xezabivapufereni.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/9f815fa2486e42152fb4a86101cb3fa5/63838926524.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/zidunijilikoxap.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/zavewopu.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/tjmh1bm4jvnpm2r41mlf884pd0/22743394274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=online+live+casino+blackjack+card+countingPDF 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_off0000eba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 16788 bytes
SHA-256: 6121a8064ac3b797ab0c84370306957a6b349283bf52f8d802d3613b5ab14e22
font_01_sfnt_off0001177e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177E 11100 bytes
SHA-256: c0d4dc2e89856353baaeec05ee8263aae9d6f0627f1bd3c4e842aeac4f80f9f1
font_02_sfnt_off00013159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1