Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea399c3c82d143c2…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 08:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bb9ea4d4c0e2bc8260ab9f6641146c3a SHA-1: a5c43b604bcabde0c5cd79eb69dbd0268f4d3edd SHA-256: ea399c3c82d143c23d96b52db0296ac41d8daaae00a9ab2bfe80633ab1bf8273
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to further malicious content, potentially leading to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f8e99bce0---96180652359.pdf In PDF document text
    • https://orrizon.ru/images/file/fisekemexowarejofafowozen.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb0de7be0---11934876773.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/22031672047.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/654oi9l5kqc0sjqstrh3p0deij/22919994703.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/lupipos.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/sekogupojadur.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44ef98567d---82719379390.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/71150470317.pdfIn PDF document text
    • http://hzqzg.com/d/files/jijitida.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/59146444233.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/mupajenunanukawulugazulin.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/33857299085.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/gametiluk.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/9668a7d5bdf29bb02ca7628764d0d81e/vawudutubuvijuni.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/2175443434.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/guvenegifivepovepesul.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/hk272tcc71tdtfse66er15oi86/79419896339.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/8781223685.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/56661154636.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/98401214500.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/petobefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=easy+pdf+best+pdf+converter+apk+downloadPDF 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_off0000d526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 18728 bytes
SHA-256: f993a52c4d3e5d4802eb01f35220cb1ba18446c430d882a6c43e682bcd384bfd
font_02_sfnt_off00011df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF2 11004 bytes
SHA-256: 514e738f1d67d74cfcb1b0e1707be2b65069332939becd7716d285ff2f627942

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