Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83b1d42139ac66a…

MALICIOUS

PDF

77.4 KB Created: 2021-09-03 04:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9da7260a50573a81167d8348f86291a4 SHA-1: ae67010cc7159031f758b86e0cd40fb189df353b SHA-256: f83b1d42139ac66aa60994b3ceada02646f8933097146f043c1274af62ad7a88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and is structured as a link farm, with many links pointing to compromised WordPress upload storage and disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=fatwa+mui+tentang+vaksin+rubella+pdf PDF link annotation
    • https://gs-hemeringen.de/ablage/userfiles/files/ladujegozokododuwit.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/31224117390.pdfIn PDF document text
    • https://digireg.it/upload/jevog.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7eedf1625---laxejuzepelewaze.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/df57cd2b39c614dd69ce62c03ae1036f/maxawopasebizuxaduk.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/98228711602.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcb967d391---62812203680.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/c27c3b3fa9b19dd0b39ed3a6c7d1352b/18817003918.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/pupiterutesapasesolimufap.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/66806116150.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/11376056131.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/35489237391.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3affd7c56ba94c4ef44ead5a5fc706e8/zewatudefojupazomaru.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/11730936702.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/lirelodawarel.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/41465880634.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210620_3A8EA4EA3FD1F9E0.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/kalotime.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4eacec4ac---75582320569.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094069d13cd3---bojiwuwozunubali.pdfIn PDF document text
    • http://hasyo.net/files/file/powaduwolasuwor.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/texumojigajagigu.pdfIn PDF document text
    • http://ymy-tea.tw/upload/files/dewoguxiga.pdfIn PDF document text
    • http://3asoft.vn/img/files/41004672704.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/sodise.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_off0000c6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 11180 bytes
SHA-256: 5ccaf4792c714b0b5976bb7017cf283642691b74a192405d97d8fe5b7522aedb
font_02_sfnt_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 18080 bytes
SHA-256: 2a4dc0ca42da54ff59aa9926b768c7e3e775dfc0036a085359844b2d43b9d90f

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