Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1eb9ffff9fd8ba9…

MALICIOUS

PDF

87.7 KB Created: 2021-09-17 03:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d536aa7bddd4af4315b162cf581b9e5 SHA-1: 21a5de4c2e6a213d89f3ffb1294a3399f3784c7c SHA-256: c1eb9ffff9fd8ba9dd8fee7bfb97fb4e806ee88bf61be8621e3c309486bb0309
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. These links point to other PDF files, suggesting a chain of redirection or a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd59f1bba---20431183082.pdf In PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/55876187728.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/xapilowotu.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/jopibebu.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/71414885584.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/25501198404.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/wanitujozupodezetapeko.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/32567239823.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/63338457083.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/69254116005.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/gumivisadawiberujuja.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/ragobo.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/45906779050.pdfIn PDF document text
    • http://sushibelovo.ru/files/8973877306.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/lunazi.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210905_C1409CA9BFC86EAE.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb926e108d---milowevotobalulapabazugof.pdfIn PDF document text
    • http://balone.net/_upload/file///47009395934.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/22374118452.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/75353630075.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/7931916162.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/nopozukasowevereganotepux.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/tamujegi.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/50421199025.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/dugesebaremugukobazamoji.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ce709026---28813876679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=i+wanna+grow+old+with+youPDF 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_off0000f2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 10480 bytes
SHA-256: 86916122ce6bb9cacbce4aff378e08cf61061a74c15d5946072e80f3074f6ff2
font_02_sfnt_off00012294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12294 17960 bytes
SHA-256: 59872f99a9a9bfcf6e96f335c980b56c7a7c746fa1ddcaa697b54ee0c1920d02

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