Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf09d994ed175098…

MALICIOUS

PDF

195.3 KB Created: 2021-08-15 20:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cc893045f46d83a2b7950e068984469a SHA-1: b3c8c99578f0a66d65ad3256f61850ffa4b896ce SHA-256: cf09d994ed175098ea28d30e0e937745b72179c4b0b49b89bd2e4915f3f95c38
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd47d2dcd7---2210197581.pdf In PDF document text
    • http://dioceseofniranam.org/userfiles/file/90441124770.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/78880643592.pdfIn PDF document text
    • http://hkalc.com/userfiles/31946177428.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c866b164bf6---masaben.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/fa09b6fdc2e8f8cf596af21dc9df41ee/68961859681.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210606153230171.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/robapewemurafeluz.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f092edea1e---kovokadizigok.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210805_1C1102E2F53169E9.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/81615407852.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/lobopoloxawokudami.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/815m9j5f7r31onl98no9h3qk50/30025509472.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/66977575862.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/mabaf.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100633fdfd1e---kegapinidajuzura.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/83844940998.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/46197188275.pdfIn PDF document text
    • http://cloverdiamond.com/file/dugizikepewefix.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/73916438189.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/24772407780.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/921t08urtqfqng1ii6536i5a3u/kelarebupuxoku.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/44484393539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=law+on+obligations+and+contracts+by+hector+de+leon+2014+edition+pdfPDF 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_off00029b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29B86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002b398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B398 17792 bytes
SHA-256: 404eeeb4bc96e865fa97c9c7918c572636b3acbb0be850701e5dff39f81c8d2d
font_02_sfnt_off0002e25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E25D 11568 bytes
SHA-256: dba6c28fdee7c7437e0ff407a2d595afd177622b4f21c9444b773b686db21ff8

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