Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e9587a13567e31…

MALICIOUS

PDF

90.6 KB Created: 2021-07-15 12:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 46841dd6d9f2d59dcf464fd0e1c8f51c SHA-1: 6272500b87f6f0c0dc895fbf2957fc44400a2511 SHA-256: 71e9587a13567e31f425bc0aa26500034c94ce9eb2a87aa5503ee5c8ffece9d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that is designed to redirect the user to external URLs, such as https://smidgel.ru/uplcv?utm_term=proficy+machine+edition+free+download. This behavior, combined with the detection by ClamAV as Pdf.Phishing.Trojan, strongly suggests a phishing or malware distribution attempt. The numerous links to compromised CMS upload storage and disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://smidgel.ru/uplcv?utm_term=proficy+machine+edition+free+download PDF link annotation
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160da2f57d7edf---nogibutixowumit.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b866fbb342a---febufuvowuva.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/tavew.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/9049389730.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/33520796765.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/38198957140.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/tdbiktq88ub71ujt75fvurso00/11291493037.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/36526805622.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607567b3eec73---logegodosewuturexi.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/jekosekijarab.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/e3d30303c1d3ee36baa89733b778fd0c/xejowilufumixomozozekeb.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/28964123119.pdfIn PDF document text
    • https://esz.jp/img/editor/files/4895033414.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210712_EF2FC49D39075BF8.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/46633334751.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/99783208959.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/e68d3f93ba55cff0f63ff46ed92cf80e/gamirureneworudovabi.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608be9fa95657---33477407739.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f287e6de940461f2adbcbb2e9fc77231/19768928895.pdfIn PDF document text
    • http://belhavenhighschoolalumni.com/clients/13962/File/28536070440.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AE 10776 bytes
SHA-256: 1b4ae265938b06e6f4a8c0b01e0537d3feb758ccc139768940dddda0645e9c95
font_03_sfnt_off00012c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C56 18516 bytes
SHA-256: 82fe034da83c8890a86b1bcc581b99886d7c2a429ed6c942b9fc9ce26627eb4d

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