Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b1294cf8390d98…

MALICIOUS

PDF

92.4 KB Created: 2021-07-25 17:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e51cd7c20ecf6b4864268e2f8f2807ff SHA-1: aaf363ae16591c7e0f6fbe2e1113cef3f2bfade8 SHA-256: 25b1294cf8390d98620372e45d039e4b17ae0cf4086dc0a80a7a9b5b84696755
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The file's structure and URL distribution suggest it is designed to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/e5093b500cdc7349e336c445bb19124f/xewixab.pdf
    • http://midel.me/userfiles/file/sajonenojevotomakulodata.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/7719ec94e398b3dd8de36590be22ffcf/30315712233.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/3n25egvmkkq5pqcdsho112m3o4/gebumuzibivuxuf.pdf
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/81587974888.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aebd99d5880---18379693998.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4c88110d39f87401cdafc919460f9f4b/wiwoxododomuwod.pdf
    • http://raffaelecavazzoni.com/userfiles/files/79757438919.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/325102d908d026c5eb19ec42202e0bfe/51198179818.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/vsq2i742j6ankep9pt4v4s2e64/tamewopatobakex.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/896df2a8886a654094a02eb2b4cfb907/xitiwafikafof.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7887d129ce---73459340633.pdf
    • http://hud101.vn/webroot/img/posts/files/74694193545.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/ace221327189bb9ef8f9555f6c2bd264/xidise.pdf
    • http://jshtextile.com/UserFiles/file///puzesapitipodisisazovun.pdf
    • https://sinhadventure.com/uploads/file/78915946080.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e3bb7b884ea71778134afdb3201f3861/45945787168.pdf
    • https://nikosdimos.gr/userfiles/file/torivokafepegedifopupim.pdf
    • https://tecnibat.net/uploads/archivos/dilerosekos.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c120047ae---86653482314.pdf
    • http://timandlor.com/userfiles/file/talipadevawujavil.pdf
    • http://autosklo.sk/pictures/file/tuwasujiku.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/dfk61cf6fe73fnrv73s8uhavn4/fopikimososuxexipul.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/5qqt41jb4f09m5goinheu4sleo/77026589346.pdf
    • http://leoclubmarsala.it/userfiles/files/wizigizorur.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=problemas+resueltos+de+funciones+lineales+y+cuadraticas
    • 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_off0001023b.bin
b22719fe466542dbf3ac340f2fe1fa80f0536062f2a01dbb42304d94d16138b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 10992 bytes
font_01_sfnt_off00011bc6.bin
0395d4d90f5ef0eb7fa237c38be5db70b766dd1a142e1aecc2934fdf7e9816f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC6 17604 bytes
font_02_sfnt_off0001489d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1489D 16792 bytes