Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fcdb27036b4756…

MALICIOUS

PDF

73.7 KB Created: 2021-09-25 11:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 96456154c9c408a2ae3e8288994de0cf SHA-1: 6a82dc393f1152f8c381b6e7ac424b32450e529b SHA-256: 20fcdb27036b4756ffa3eba85eecd2044817ab907a42b5ef803cd0d6be65ec51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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=onlyfans+without+an+account PDF link annotation
    • https://dallaslandscapedesign.com/media/files/bukoxowilizam.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f570e63e22---bokiwafixesat.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d96751b57a---kibedopopavovepimezoxu.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/bijes.pdfIn PDF document text
    • https://eventaipei.com/upload/files/nakisozobebude.pdfIn PDF document text
    • https://stotex.rs/files/42584051502.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210920052839_i1gwms.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/656mvcearqvfk2qnoi94suh0na/74163182576.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8501737a856f869ad2dc9a2a148ab02b/97359453941.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/nekunesotumesozebunilofam.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/zusobisogapumodedibafaxi.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/96403345645.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/lupifubutotikotasizoriru.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/65257254610.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/muwapij.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/lilomiritosorakes.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/vadagutabikikoze.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5ba60e30a---likuxuval.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/54585952185.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/bonatiset.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/bapowinajun.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7c6209c3bf39cb49159c4d22169efcf0/42074021981.pdfIn PDF document text
    • http://ud2-140.com/files/neziwupupiluvopam.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/68968904536.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/81441737525.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/xuvaxagemenego.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_off0000ba09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD220 10528 bytes
SHA-256: eb358392f790731f6bfb09463cbeb332311ac209adb7076e71e49e6d1aafc2ca
font_02_sfnt_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 18540 bytes
SHA-256: a8c722827d5d88cf91955e0b3d4301cf31c65f8f368e01b3f79f50ffd463784c

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