Malicious PDF — malware analysis report

Static analysis result for SHA-256 f206e595b007e7f7…

MALICIOUS

PDF

78.6 KB Created: 2021-09-12 00:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2414b2a9445b68c95e31afe2366e99cd SHA-1: 614bb2db86582a7166fd0b039c87d6120f45510e SHA-256: f206e595b007e7f72e7b35f3bd90099f16901d34f104922d7c7a364cdaa61ec2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript and a link farm pointing to multiple domains, many of which appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://allytemp.ru/uplcv?utm_term=organic+chemistry+1+notes+pdf PDF link annotation
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/22950458272.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1e15ed94b---32216713498.pdfIn PDF document text
    • http://blueyee.com/upload/file/070256327577.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/lurebusalunadibeze.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/27972642086.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/viloxifikag.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/16724500962.pdfIn PDF document text
    • https://edarky.net/data/file/detigelonidenuvalo.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/vofefinidadevibikuguzem.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/mulelopux.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/70555955544.pdfIn PDF document text
    • https://aaaxxion.info/images/file/suzezosisagebivupu.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/sifutudunugebuvi.pdfIn PDF document text
    • http://berbun.com/user_img/file/gasamugedawanasesotaj.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/kapisuluravuweruka.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/25251974200.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/kalofutafesalago.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/99704121775.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/4876942134.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9437b274e---vemisuzenemenad.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/36195811973.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f375bdc90---32883719007.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/zawuvobujoguj.pdfIn PDF document text
    • http://yongqingtech.com/d/files/51988420679.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/28043970186.pdfIn PDF document text
    • http://njchemland.com/upload/files/86424174842.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109051359052966.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_off0000cebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBF 11212 bytes
SHA-256: caef56ad229b146ce2780b74155ca4e8a185b0e96b5612ead13c05837c9638f7
font_01_sfnt_off0000e8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 17224 bytes
SHA-256: f5684cc1c4f5207110426307e7eeff20bfdf9e2fca8a68835d794cde19c69a7f
font_02_sfnt_off000114e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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