Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ce3dd3fbacb466…

MALICIOUS

PDF

75.3 KB Created: 2021-09-17 11:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 80223c8bcac26b6247cb83b80cf3e6db SHA-1: e16e6b5f871dfa8ab2cea5f23459201cf500b52b SHA-256: 25ce3dd3fbacb466b885dc50707f5f3a35f7784a55be212260b506d64566330e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, several of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://jingmingtai.com/filespath/files/20210909061326.pdf In PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/wopukoderasudera.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/9205754989.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/xesuveregor.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/45020504339.pdfIn PDF document text
    • http://popmetre.com/news/files/26372558686.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/wivokosolaverululupu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bc20af5ec---1480226542.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210908_035544.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/45861830197.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/pinodidulowosujukivesa.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/40um9gri2ppvqf29jeq6td6u12/nilemivilimusivura.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/ximagupifefaguwitugi.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/wadifuzumetidorekotoja.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/63807551884.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6c5b9a5c0---babavajosipupapuno.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/73503775344.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/61902208369.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a61475c71---punedukaxazaxulal.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/juveneloniseja.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/vixuperuzuwuwapelum.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/pemewifinodopa.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/duvirorase.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/tedegokibuwupobadabup.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/lufaputofi.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/70726180395.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f69d5eb029---gobibafefujafefuxesabix.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/kurajopage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+set+default+app+storage+to+sd+card+in+androidPDF 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_off0000c233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 16668 bytes
SHA-256: 5a9699c57cf4cf24a52c7e2857ad1c868e798264655839b0961d015d61d686d5
font_02_sfnt_off000105a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 10972 bytes
SHA-256: 670ed08d41cb2f2baa0be456078336cc9fef26938de4879a3eb2a27d6a05b468

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