Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9ed75b81c7def8…

MALICIOUS

PDF

66.5 KB Created: 2021-05-02 14:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c5af4309e8b40385a1196853b6b0bea SHA-1: 3455174d06dc758b176240192846185e3ab6a06f SHA-256: 7e9ed75b81c7def88d6d108acf50d4da1932517f4eecd630eb8bd47407392009
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links to compromised WordPress sites, likely serving as a lure for users seeking cracked software like VMware ESXi. The presence of multiple PDF_URI and PDF_RANDOM_URL_LINK heuristics, along with a high ML score and ClamAV detection, indicates malicious intent. The document body, though heavily obfuscated, contains references to 'Vmware esxi 6. 5 crack', reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8201

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceebd7bf58---witopulikos.pdf
    • http://adamlegal.com/userfiles/file/zaruterekubenovuv.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/2de5a633dc83e24b227791face42d550/romemadegiwi.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b1b518798---83611627774.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072778c8e050---63027949578.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074892b4ec99---61080573259.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/tue4d644t3opqtd2d1b2rh85vn/42239911995.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1fa7ef997573ce39a198e0889b146cd1/60101934512.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608db8f8f293b---ruwugivigopujarulolozeve.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52b547300---nabekepupi.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/47501ea268ace35b4b77b1b5095e32f2/jigetir.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160849dec7eaf5---35421710653.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8b037c279843407a0973a4982f8c2f5d/redijozoruwozokupuk.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c2dce2949---wabovabimefamufusezo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=vmware+esxi+6.+5+crack
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd8e.bin
70e27cb98c07166dd64b2379a69234959369eba834b001e4cf5a44efc926f299		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 5412 bytes

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