Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d97df058c0b1e5…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 14:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 00144e56adaa33a06a26578e2c945d0b SHA-1: fc903188598b97c592ee06353b54d1b4af5b9add SHA-256: 33d97df058c0b1e5f7f58d4170a90cbb694dbb883371e028856386d454a94055
164 Risk Score

Malware Insights

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

This PDF document contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The primary URL suggests a lure for downloading a game, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to execute the embedded script.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=gta+5+mobile+download+ios+free PDF link annotation
    • http://ferrocom-spb.ru/userfiles/files/64323954632.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/11277ffc11dc3bd5087b7cdb90431f46/fuxodutinifugeliki.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/disifisamak.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/memuveroxazufigu.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161358b6003281---78526597926.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/6764040451.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/jorufubi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131d27dbecfc---lamifafukigolojat.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/25617130630.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/wojeleluja.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109041913463890.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/lufakisibatufewi.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/gawosutuk.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/57834323095.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613143d7239df---ropuginuxufatitobegufaj.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210909_2e20e.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5a040bcf8265a4bb3af8712f50d685b1/21554485178.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/90849822421.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/33246207800.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/81336163498.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 17160 bytes
SHA-256: f4c7ef7f5da00453950add6d0b3617dd9c8223e1e28423a2bccf8a03d86cb95a
font_02_sfnt_off00011f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F88 10916 bytes
SHA-256: a4b1b7d22dc05c9e2897fd7bd37546ef0aba21080d9b2e27181681eb7da44816

Open this report in the interactive analyzer, or submit your own file for analysis.