Malicious PDF — malware analysis report

Static analysis result for SHA-256 df18d42ac5eea3cc…

MALICIOUS

PDF

77.4 KB Created: 2021-09-02 10:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dbd23026712c556ed87ae788b2123261 SHA-1: 412705f98a2a1d93f5736465bad0ed96d9629b09 SHA-256: df18d42ac5eea3cc7054651e9ed565bc2b508ba69c504c1e912f5ebce104c213
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=types+of+protein+kinases PDF link annotation
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf9568f698---52167745314.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/96649549609.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/rexumaj.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9b5c714e088ccaed2455381b5f044715/razivubusuwexi.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/fuzokefotena.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ldf8horj5md11qjkcumf0amqu6/66687275381.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/43070501083.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/jutonobizow.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/88739463984.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/lamarabazisobufewikutuwoz.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/puvagejapav.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/sp9vb56h6krbdpd4n39usc9667/79260506203.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/l0c9r02hn9rv0bovi6ghs3q6kl/saxetuvipotubalit.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/6d323cec45bc11106dcf85e48870cc4b/44835046974.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/diridaf.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/um84jntbnruu7iksshe76euk89/41173225988.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/fisetavakixolasaso.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608df7b9b206d---rudisugidexat.pdfIn PDF document text
    • https://badoza.net/userfiles/file/xunikolive.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/nitidiginexusofaz.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086fe177f879---96473035433.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/91562180700.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/r52rgb81lbc8vkf3lqt467jn8p/figuzotekovazenurofol.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/winogibab.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_off0000c773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC773 18768 bytes
SHA-256: 271deee7999cd03e33db746198fd6a22e0db4a807cdcc0a6edba59202e09a834
font_01_sfnt_off0000f71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 10472 bytes
SHA-256: d97e8edf735693a4bc2311d644a47b98ae7c4f8838a80ed383a74551b3b6a3cf
font_02_sfnt_off00010f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.