Malicious PDF — malware analysis report

Static analysis result for SHA-256 532a7010aa665adf…

MALICIOUS

PDF

71.6 KB Created: 2021-10-05 22:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c407767342ecbe1167112f304f64da2f SHA-1: 1613f9a234174a515c8f5d650cffafa34723e76f SHA-256: 532a7010aa665adfeada7b16ec7f68fe6f8b2ae4f2d20f5ed1307769c29f0547
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://peperita.it/writable/public/userfiles/file/47234619968.pdf
    • http://123flower.doweb.kr/upload/files/jidunij.pdf
    • http://mocphatreal.com/assets/images/ckfinder/files/rejesav.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16143f7b9a6612---boxusipa.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/402385657c60b1867a37ee31db9fb824/govupubajutaxiwomodaxivom.pdf
    • https://brihat-group.com/assets/userfiles/files/topamolomavunu.pdf
    • http://cafemsoffice.com/userfiles/files/99921957694.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/gf0ooq47i6g6psn3kmam93fchg/patenejubagu.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cffe21a91---vopelukonano.pdf
    • http://otczenacts.com/media/files/93637859351.pdf
    • https://kcharp.com/ckfinder/userfiles/files/23810458648.pdf
    • http://upnbkk.com/file_media/file_image/file/desevumomuluwetawaleb.pdf
    • https://senegal4d.com/contents/files/tusijosalila.pdf
    • https://stealthwindow.tw/uploads/files/202109270943434184.pdf
    • https://parfumzone.ro/files/file/86456076495.pdf
    • http://cainghienbinhduong.com/uploads/userfiles/file/22332555095.pdf
    • http://machulski.com/public/file/bezasugefofopun.pdf
    • https://pbpkrosno.com/fckfile/15806786021.pdf
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/jivakalituri.pdf
    • http://islenapuntos.com/campannas/file/90928842718.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161462f5342ada---faretomotoj.pdf
    • http://cukiernia.eu/upload/files/bubizinazude.pdf
    • http://carzip.biz/files/uploads/files/tanazepugukurun.pdf
    • http://sibzakon.ru/ckfinder/userfiles/files/dinowim.pdf
    • http://kantipursecurity.com/userfiles/file/66457930637.pdf
    • http://globalbando.com/DATA/upload/files/202109141607068181.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=today%27s+meal+for+the+emiya+family
    • 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_off0000ba0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0A 16792 bytes
font_01_sfnt_off0000d221.bin
3ee9ca6425e54eaa32ef1aeab5f38b7d319efbd30d6c2f237353438e961d041a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD221 10624 bytes
font_02_sfnt_off0000ea76.bin
2a36967bf93045dad2174497b27e41b095c38ecd8dd91a6757b43f826a42e7c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 15080 bytes