Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdb12e64c2fb218…

MALICIOUS

PDF

75.2 KB Created: 2021-09-02 22:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b97b92ae31cd1033712e1f4ffe99b6f2 SHA-1: 679202df219c622be1719d9d31843c66dce6c9a3 SHA-256: acdb12e64c2fb2186d06748655c9ac6c09598e08a4d02ca803b3627b59a49b4a
104 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate the presence of external URIs and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malware or conduct phishing. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • 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://synerhu.ru/uplcv?utm_term=subatomic+heavyweights+isotopes+worksheet+answer+key PDF link annotation
    • http://cn-junsheng.com/upload/file///20217564495356.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e680d6d4e---gegupifubizofaduso.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609823bcbd17f---ronafadawadux.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/gesizeteporoxiluzofeveza.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/40945808973.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/80jesf1ukr331f2vf9jqspjpkj/45855417589.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/24449653334.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/tuwezonolarefakajewix.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/95805553386.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe5dba184e---zeduzubesejasalat.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/37375780556.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/jonenake.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/58937346192.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/13067675141.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/49482990467.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/86635396592.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210801_112420.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210821_233637.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607505b2bd707---23617902989.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/92994173770.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/17846112206.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/4oitll7gcnjio33km4m4nnoal1/83063177448.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608936999bad3---fixibitu.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/nikibezogunoret.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/69386964635.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/dagosuwapubedagasata.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/54027846191.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_off0000c03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03C 16972 bytes
SHA-256: 7cd2a5440fe80987d975485fd2a0e6c3763cc2f8b38aea11a6a31cd8c4d3747f
font_01_sfnt_off0000ebfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 11448 bytes
SHA-256: 11255bfd85f073c5053b0b005f1665ba6e79e5f941251b81230a55c6d6d0cc77
font_02_sfnt_off000106bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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