Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efc63e5c13577dd…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 03:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c909cd0d160c858953545cb489d20990 SHA-1: dbd606cbec8e8aa9177c5f64297be2df7a83c6bc SHA-256: 0efc63e5c13577ddec47d92fc34ef7d996d58e6a16253f3a2d2a0199d5e3ddd5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malicious content. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://quangcaowebsite.vn/uploads/files/30103762724.pdf In PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/xojunita.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/nebiliwu.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/mesubitolusewilitusepud.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/lujikuvejeditob.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/zirizezinoxodozumisolirab.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614283985c2db---36087500960.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138079c39ba2---rogiwokitaporirikilokam.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/69108893915.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/zuzugewaboju.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/56511504807.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/venomebun.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/walezuwinusufozew.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/xajerulajopesaweturanor.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/fetibezoxovofakafiperi.pdfIn PDF document text
    • http://sayarbobinaj.com/file/ribavodune.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/nokesawexekozudewo.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/20480501613.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109122228228764.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/95623286589.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/61728119642.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/mugasibezirutokelikusele.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/12959182296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+hide+files+on+androidPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138566fbb44e---63982434667.pdfIn PDF document text
    • 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_off0000ce6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6E 17444 bytes
SHA-256: 529ba8ed01d30602bbd9cad932e229379a1cb43c79d8aa8c7ddde4b2fdc270b3
font_01_sfnt_off0000fbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E4 10528 bytes
SHA-256: 1e2958c43f8d34ca4c989a202b4bd14c81fb7c52c98ec6f849db9e2fa0987e86

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