Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b79a96c437e9111…

MALICIOUS

PDF

71.4 KB Created: 2021-09-20 13:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e5507fe02dd44bfc157712418a461dd1 SHA-1: 102b50c12fb4a0cfc39b48152820b3aa95cd26ec SHA-256: 8b79a96c437e911111df72f21a74dec9fa365b1681d6baacc5a22f5902e7b8d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ketchas.ru/uplcv?utm_term=christian+devotional+songs+mp3 PDF link annotation
    • https://u15.ch/ckfinder/userfiles/files/bolenedamexulevusipa.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/zuwowedogikare.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021091802030971.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630881880nUKw.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/12594296749.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6142ed23e0af6.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/godubenukukepubonot.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16145c3d8efe87---84242504516.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/d1kv5lslsdqpgkvjjr4uf17i43/43525374905.pdfIn PDF document text
    • http://preprod-proximeo.com/ckfinder/userfiles/files/suxajal.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/41826018842.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/7cd43744842a9f65e31c9600497dc295/29085389711.pdfIn PDF document text
    • http://djapm.com/userfiles/file/68626905690.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/18634867765.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/guxanotosuxitujagapami.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/lajenatu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142265f21fff---resal.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16145aa3b792ca---33636236604.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/44932260997.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/kolekininonudunaxofa.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/gonapugi.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/20173473723.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_off0000b65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6C 15556 bytes
SHA-256: 336fa38f3990a5c5db627b548e8424a67f88f7341fef2a97c5349c9378635a38
font_02_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 11108 bytes
SHA-256: e961c78a6e2abce293fdb9586950b216835a4396d0ce29f52166fc7fe3c54a21

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