Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d2ba854801cf4e…

MALICIOUS

PDF

93.0 KB Created: 2021-07-03 11:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98c640e299b6a16aae183fb6ea4ec4db SHA-1: e6ab725ce7af5da7fd5e39ea54afd9f662eeaa3f SHA-256: 50d2ba854801cf4ed90a016f1b36206543183c73cf59a6dc4212fd29f7ba5e6e
176 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the link farm heuristics point towards an attempt to exploit user trust via a seemingly innocuous document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://matstravel.ru/userfiles/file/numizusutonewelas.pdf
    • http://bygreenpure.com/userfiles/file/sisega.pdf
    • http://vandientuchinhhang.com/upload/files/19281311931.pdf
    • https://kaptenhoki.com/contents//files/gigemegamuwi.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/agga9gmbkavh6pg6ls235rj387/jodirixaxivafezedevir.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/5fc28a869d4aa5b1173e60a7524f3990/40115038623.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/44062193421.pdf
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/10497115948.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/04b7231efd4e476cd49cca72841094e6/1288500181.pdf
    • https://olterus.com/contents//files/nokuvoxe.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082e1ad988fb---nomulujikukoxexabomo.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c10635bbee3---bexed.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/993a748e199db97c0973d6d7030fb128/bumebesimimakimup.pdf
    • http://vyveva.eu/UserFiles/File/leram.pdf
    • http://soflocops.net/clients/81266/File/3792020848.pdf
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/27592759871.pdf
    • http://conblocmanado.com/pics/file/ramusorufuzopexi.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/r8f8krbgui742276hue6tdpeq6/kogotodow.pdf
    • http://amoy-art.com/Upload/file/zovewipubide.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4fac39a36---25288775299.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b54d4c86---28147318483.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/dlg5cpgavfokvka22te6la2rvv/wajolorelobimate.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094220905d86---27937824946.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078e0572b390---30027884860.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/5n6ah4pk7pp0nudddrgbjoouuv/vabuk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=christopher+columbus+misconceptions
    • 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_off00010749.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 16792 bytes
font_01_sfnt_off00011f60.bin
6a9e34131a915cc3fdc7dba0deaf224584e975d33a4fdf634b9083404b55205b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 10748 bytes
font_02_sfnt_off000137b0.bin
ff9972fa1894ae7611e55eec50b5a5c148a56463bc09e73bea6127604c42dd2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x137B0 18304 bytes