Malicious PDF — malware analysis report

Static analysis result for SHA-256 42774e5c899dfd48…

MALICIOUS

PDF

86.9 KB Created: 2021-06-28 22:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 902d20012b3c500ca5e90c16f569965f SHA-1: f6563c82cc44fc53d58949a1d635c35ce50cf489 SHA-256: 42774e5c899dfd48953a83b0eb1b94b17db871936ae5c1dc173eca12b5514585
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites hosting further PDF files. This structure suggests the document is designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • 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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4c1bf9bf4a82a72c1e389c720fe951e0/notapal.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a735561cdc---gadagitarokaj.pdf
    • http://apcmagon.com/userfiles/fajip.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/d9576de7dd9e713f603c5a200d3ceff1/xetimigumanezerewuxijur.pdf
    • http://hieuchuan.com/upload/files/23709568660.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723313916c3---42406326216.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ugfgk87d3td7ktdo12pf3hsot0/rimuwakovosa.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/61af55247ce7eb554e5aa7aba0d8dcb7/60999197613.pdf
    • https://luyenthitoeic.info/userfiles/file/27912100075.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/k47vkhhojq638e8dgvgi19mokg/kinusipixer.pdf
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/94821724620.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c9206488eb2---63893461406.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608318cf1262d---piruwuvu.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d249c639c---76239882558.pdf
    • https://resulgame.com/calisma2/files/uploads/nabovike.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/09ae98b349a00f7855a6254d98dc9d66/tepukularutosu.pdf
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/70544201303.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160817de58e757---xezog.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceb3901a4a---52480800986.pdf
    • http://vinmexindia.com/uploads/rozuwadejusujuwuba.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9498aaf59---vosotamujegixivafuvopila.pdf
    • http://bkdesign.ee/userfiles/file/kitojejevimunigiteke.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/vugukofamobiv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=no+state+shall+make+or+enforce+any+law
    • 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_off0000eff1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 16792 bytes
font_01_sfnt_off00010808.bin
054588d107e3aaa8a57cbfb202975196ccff94cd9504bc8a39c601200d106eb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 10780 bytes
font_02_sfnt_off000120cd.bin
f8c04058c9448628a18be4bb32ef3c080d758223d778856ed58565968a89024e
pdf-font-stream PDF embedded font (sfnt) at offset 0x120CD 17628 bytes