Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55be7d13ff6a309…

MALICIOUS

PDF

76.9 KB Created: 2021-09-06 00:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b8390965a18b8abf3eab4df7e3ec8b4 SHA-1: e6da6f3bcd3777c3a87d72b87cb7c5834d086bb6 SHA-256: c55be7d13ff6a3094d523cd4c886835f9f887e16ce69f820961d7a6eae219bcb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to disposable hosting or compromised CMS uploads. The primary purpose appears to be to redirect users to malicious content, likely a phishing page or further malware download, under the guise of providing educational materials. The embedded JavaScript is likely used to facilitate these redirects or obfuscate the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://drafthe.ru/uplcv?utm_term=sadlier+oxford+progress+in+mathematics+grade+4+pdf PDF link annotation
    • https://ajwatravel.com/wheelmarine/userfiles/file/zutofifevinom.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/botumapof.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/65147496218.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/rogadanelivejopuwojobibu.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c2de62efc29---55772372576.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/82191840855.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/47baf2aef44e505c055fc2b3b813aa15/70189729706.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b022c73e5d2---xirezamuwibufovexeteta.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/mawoloboli.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/68ff9b0fcd3b7c55f1eb32e3e0dcc86f/71957938792.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/zokejakeguxenokolawe.pdfIn PDF document text
    • https://bem-sa.com/img/file/75781554487.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/78430817658.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/zavir.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/lurojeririrozadasebe.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609410b3d522e---pagiziropij.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/46179733393.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/50177092632.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/debabikep.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d73c95cccf---66069541302.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/8995305404.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_off0000c477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC89 18008 bytes
SHA-256: c9b736bf44ca464b9bd4a5d7a7643c1183904d2c32dcf4a81919089b94fa9d2f
font_02_sfnt_off00010b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 11320 bytes
SHA-256: 4ffaef168f797eac1b5b5252d4661653e8554cd3587cbd9edf6ea0ffd82a7afa

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