Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d013093bfad0721…

MALICIOUS

PDF

73.3 KB Created: 2021-09-30 13:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2e1389511409f28c72ecf1faa7f55c6 SHA-1: 02a4b27b22fef236621455a2b66a2bd03e724780 SHA-256: 9d013093bfad0721223a7331199dca5798bf955eb7e97eedf87d2fdd6bc4ccdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://wahluenfty.com/userfiles/75002207644.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2792b9f8ca2f2eb3618df10ef6f8f569/1817246102.pdf
    • http://nghieuphong.com/upload/files/bexixekamapato.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614f132b5cc1b---62642180617.pdf
    • https://sporyolu.com/resimler/files/22935058632.pdf
    • http://dorp.pl/userfiles/files/befevekux.pdf
    • https://huaienclinic.com/uploadpic/files/63249497377.pdf
    • http://asupuro.com/upload/save_image/files/vodajozosipotisokomuwi.pdf
    • http://braghieriarchitettura.com/userfiles/files/fagakelibegajenatukolevig.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16153d7c84ce1c---16481498078.pdf
    • http://vrakskodamnetice.cz/file/68579147109.pdf
    • http://www.heksan.com.pl/file/57174385642.pdf
    • http://aallergy.netlovestories.com/upload/files/10221217035.pdf
    • http://supair-lux.hu/ckfinder/userfiles/files/laxujaretanubulud.pdf
    • http://esangsok.com/upfile/files/39536329325.pdf
    • https://www.rapn.ru/ckfinder/userfiles/files/bofebawavuxokuzizozu.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/50273973810.pdf
    • http://longchimvac.net/app/webroot/uploads/files/jedijedinarogavezix.pdf
    • http://jvcc.cn/ckfinder/userfiles/files/2109130200404918191xea5.pdf
    • http://drxzhang.com/userfiles/file/97900724247.pdf
    • http://vinhthuanvietnam.com/upload/files/zipamumig.pdf
    • http://infoegrafica.com/userfiles/files/gipodugen.pdf
    • http://malabarisproducoes.com/arquivos/files/negoso.pdf
    • http://bacvietexpress.com/upload/userfiles/files/komuwofoxitaboruz.pdf
    • https://ripedzn.com/app/webroot/files/fckeditor/file/38151021108.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+turn+phone+off+without+power+button
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6d2.bin
716f6039510182a7867e00d6d697cef697c8a884c729c1cea28d7d52fd975c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D2 19372 bytes
font_01_sfnt_off0000e858.bin
bb69e28ad8e92a054a790c335904ad579c8c5b9c793b41c087235a70457d1be2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE858 10396 bytes
font_02_sfnt_off0000ff8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 16792 bytes