Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f4f03d56e80004…

MALICIOUS

PDF

77.5 KB Created: 2021-09-13 05:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b051f4f9d35be9979d08d6c3b0512a02 SHA-1: 9812304a040c5909985f3a837080d935810753a9 SHA-256: f1f4f03d56e8000403d3cb084f2343acc7376e60bf289f5111c0641a8fd6add4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b27117562470b79403d0edd43b3f2c7e/fefefodiwezasuwuf.pdf In PDF document text
    • https://przyklejki.pl/userfiles/71614156959.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613eadc7a6601---gebufa.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/mf29aarqtsh20c8snkqsrirkjl/5348661264.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/40730311531.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f601b8cef---linigururute.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/vozutoj.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/jegibopopazunu.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/xawiwanumaje.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/81404747561.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/wigevowofe.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/43040376714.pdfIn PDF document text
    • http://kunbot.com/upload/files/lagepalare.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/tugigopapituxivoxapija.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/rapugi.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210908_089228DDB905753A.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/72273215133.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/bopovonovodanujidajid.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/86991308560.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/o15bvmspd1rc465r835khhat70/fexurunutaxamisuwa.pdfIn PDF document text
    • http://sun-eko.eu/files/file/judulavedokimufukexumed.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/60843973172.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/welinexogisorifasakadaneg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=purple+betting+tips+apkPDF 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_off0000c90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90B 10640 bytes
SHA-256: ef5c604a06fa7720b32ff0970bf6e167d5828442027beee4bfa9665a3100dd54
font_01_sfnt_off0000e143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 18088 bytes
SHA-256: d6b4cc8a9705209c8918ba509fdeb16d80111b0a59f32a14b0dfbd045ca5f30a
font_02_sfnt_off0001101d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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