Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdff07d43d6c6d66…

MALICIOUS

PDF

78.8 KB Created: 2021-09-23 08:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a21a8fb70af5cb0e2faa5a0ab719294 SHA-1: 0b7dcbca0dd0e92557e32f51057b8cfa13959e39 SHA-256: fdff07d43d6c6d66bfc79ce1d2123f5d707f849513a36b7febe683abaff0204c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that redirects to multiple domains, some of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to further malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 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://gardena.crazyrockinsushi.com/uploads/files/vabawapitixosololowufiner.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/vt1g2n8vqodbbvvgjg9n88pp1t/sidagutugosunixowaretopa.pdf
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/84366105735.pdf
    • http://cuanhuadanang.vn/uploads/image/files/46998408596.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/r2u2rm5jhcv0fc2uq1nhoe75c0/39561819771.pdf
    • https://investincarpathians.eu/app/webroot/media/files/jizirujikage.pdf
    • https://fortworthdental.net/cmsCart/upload/file/16779454303.pdf
    • https://foodvellythailand.com/upload/files/mamorizulejot.pdf
    • https://sadhankendra.org/erc/media/13838253790.pdf
    • http://novo-foto.ru/ckfinder/userfiles/files/tunarizadoles.pdf
    • https://thietbivesinhanhhuy.com/asset/files/niminipodokepolaninupo.pdf
    • https://shevtsov-art.com/uploads/files/86199905128.pdf
    • http://velapower.com/glwh/UploadFile/file/2021091009450973499.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b933ef197---bonodozomilotikizutavoka.pdf
    • http://masan315.net/board/imagefile/file/22790068122.pdf
    • https://gamma-electronics-eg.com/userfiles/files/69392158672.pdf
    • https://stancijanegrin.com/userfiles/file/11496498858.pdf
    • https://florissantdesign.nl/docs/Image/file/telarupubukog.pdf
    • http://deforma.it/userfiles/files/sakibana.pdf
    • https://iqmuseum.mn/uploads/files/23762651624.pdf
    • https://petrovsky14.ru/docs/files/73099135204.pdf
    • http://pokorny-podlahy.cz/UserFiles/File/kirifa.pdf
    • https://iwistw.com/upload/files/27810465338.pdf
    • http://abwmercury.com/uploads/files/vulebu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=minecraft+android+controller+support
    • 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_off0000c7df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DF 16792 bytes
font_01_sfnt_off0000dff6.bin
bfa832f163db0cb6c470aebe7226a1dad503cf0c4969cf1a8c25a5dc062b4738
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 10704 bytes
font_02_sfnt_off0000f8a5.bin
4006ff54a5da2546ad2a081545bec0f556602eb5ad79d59bfc59ff7be1c66c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 20368 bytes