Malicious PDF — malware analysis report

Static analysis result for SHA-256 995008f14447cc7f…

MALICIOUS

PDF

70.9 KB Created: 2021-05-22 14:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab868c89b14dc57eeb434edd8665978e SHA-1: e11463ffc5f8bb52667dc7bfc44ff4e8978a16e8 SHA-256: 995008f14447cc7f642829a22518c6b3497a1cd6b2e915a2032bc852e90e9836
154 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily corrupted, contains a string that appears to be a search query for a movie, indicating a lure to attract users to these malicious sites. The presence of PDF-specific heuristics and a high ML score further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7739

Heuristics 5

  • 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
  • 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://nomylo.ru/uplcv?utm_term=wonder+woman+pelicula+completa+en+espa%25C3%25B1ol+latino+-+youtube
    • http://lab4050.com/upload/editor/file/fotadopoluxuvekakoxapi.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1aef966f4---34914008643.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5g9k930krkbtissdekkppkagch/fejufaga.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/718f7857095824e1d3ec708b0a4a1696/93301967798.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160850591e8f65---wosapox.pdf
    • http://rydelko.pl/userfiles/file/nuragidazirutiwebanavaf.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e217cef860---tadidame.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4681f4ccf4467fd925569caa931dc1fd/badafufid.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b495d54c1f9c57b9fca10a7fdfeb68f1/wozetufit.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845e1d56c57---31796373030.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852dbc601f4---linavakovuraxobib.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609432fb5c79a---34260254741.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ae7cdd79---wobibokexexow.pdf
    • https://baoholaodong24.com/userfiles/file/66242778053.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a510bd9e613---vagogozedidalalidu.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f212d0e7ff---gowuwodikaxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df87.bin
e6d334283488adccead6f08a05c8c25b4569fbd7749bdf441ff5a1bdd3d33efa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 5692 bytes
font_01_sfnt_off0000f29c.bin
3a6894f63263d54a6b05d5c640069636c10ccb60067b051da4c403b69be9df6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 11804 bytes

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