Malicious PDF — malware analysis report

Static analysis result for SHA-256 78941274fdb7a561…

MALICIOUS

PDF

70.3 KB Created: 2021-09-12 16:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 92fe8391b2f1b23b2f2b64c54f05505a SHA-1: 210bb1d64683345baec75a7d0ac297b5329d9caa SHA-256: 78941274fdb7a5610ed958565454582e2b386c0ea4b4dfe49afe0ae3f8290641
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or compromised CMS upload storage, forming a link farm. The presence of embedded JavaScript further suggests an intent to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=gta+4+gay+tony+cheats PDF link annotation
    • http://micruts.org/userfiles/file/fimamogobu.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/932503938.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/74127344906.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/raretijopilosageduf.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/pekemiwixufafoparuket.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/86168547241.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/rajizujerituva.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d008a90ff1---63163049684.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/rexifesisi.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613179ca0e633---38342992391.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/16112746901.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/fuxobujebelikexa.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/8685996074.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/76907665197.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/41726081819.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/2026777901.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/44443046381.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/vobidiwosawi.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/fakutoduzulowejomijutor.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/62271906707.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab96dc9988---tedojiz.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210910_2D8F90E84A2B7098.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/vopukufofulo.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/mukakepow.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/74188733749.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/39309502669.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_off0000b3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DE 15688 bytes
SHA-256: cb1cc568143e385b20c0e8fa5d16ea442063c465e22564a65c32d55f68c4aaad
font_01_sfnt_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 10504 bytes
SHA-256: 0ec61351adfd537751bb7940111862384765029882d71e72de3ef9d7a9cfac73

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