Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c4964516c80d95…

MALICIOUS

PDF

71.6 KB Created: 2021-09-30 20:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 52dfd5b5c14e296e2e189644dd644af5 SHA-1: d61dc556d9c8954d63f2c6d8fbce8e3b1c630a97 SHA-256: 94c4964516c80d95140ff0fd1c6daeccfcc85e1833f6069fbb2aed25ed5ca6cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=avatar+movie+telugu+lo+full+movie PDF link annotation
    • http://selidbe-beograd.info/files/34431406681.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/962d62e8205f8a19c02ad60f86ee58a8/84281413196.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/91110195733.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/cd53c77658393d579cbbf9f25a2cb3b9/zomuboferaxopat.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140909b12ac3---17043222302.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/gimubudalunojamij.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c9669a3d2ff15cfdd74a584a7b599b05/13732031765.pdfIn PDF document text
    • https://egf.tw/test2/images/file/47219835226.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe700ea96---14547962309.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/25014538026.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/43aa532f7494e7b700d2270f743ffff3/19320949690.pdfIn PDF document text
    • https://ptogel2.com/contents/files/vufukexi.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/tikop.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/dawadabikagodovip.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/lexagagabenut.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/57220990939.pdfIn PDF document text
    • http://cutskytools.com/d/files/66734434174.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/jikapoduzi.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/guwozone.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/13925308004.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/68732985573.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/visozojifagogogalojevivup.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/d6ot0psg8g1tqgl1ea7ve7shu0/xuxarepexener.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/tepem.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_off0000b18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18E 10432 bytes
SHA-256: ef8a2f252808163de089e851db1d661d773d138c5cb4a1fcfd3d11594c32bf71
font_01_sfnt_off0000c945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC945 18756 bytes
SHA-256: b1e8f7187918d84fded9348f96907bf69ade24cbdbfafef68fef600b92e7cfe8
font_02_sfnt_off0000f8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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