Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe3df993e4dc2de…

MALICIOUS

PDF

74.3 KB Created: 2021-09-12 22:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 99df72c2db0a9a4f36cd47cde87df295 SHA-1: 89fdb15ecd3421372797549f02fadbab70d00aad SHA-256: ffe3df993e4dc2deca7c4dea53c9e2f90b2e58d77ed2542a74f700a3effedab5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm for SEO manipulation or phishing. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

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://jeneifogaszat.hu/cikkdata/files/31175838762.pdf In PDF document text
    • http://cantinachitarra.it/userfiles/file/ruvaponovafemefopinajov.pdfIn PDF document text
    • https://soechi.net/userfiles/file/12025826569.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/40557004816.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/nulekaromitunedevomola.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134b9a062702---tuzaronolokoruput.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/tuponatakebaxukigofitake.pdfIn PDF document text
    • http://trivio.it/userfiles/files/62714971899.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/94574259569.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/tebazexalunexitozuba.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135447c36c72---82758372648.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/77596342069.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161373a634dc57---lanaxik.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16130b2f41924b---jotexugilulivejotadokeku.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/bl12l82hs0m5qiibu8l55tonr6/nonelimegizaj.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/dilugig.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/woxasesuwir.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/70610463962.pdfIn PDF document text
    • https://laser123.com/geektic/files/2413107677.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/33056894373.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/vowasizez.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/vikaduzaxaxonatagadotozoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=definite+integrals+reverse+power+rulePDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/vizowubotejasela.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_off0000bdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF7 17268 bytes
SHA-256: 9141baa030c403f4d666c23a6f174b88fa79cb727aa32eda78c7e8e15a6f53da
font_01_sfnt_off0000eada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 10788 bytes
SHA-256: 36396a64a3bdb9234c81aa9d817a914c104cee2dfd1a76f7022c88faa58b1c1d
font_02_sfnt_off000103ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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