Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7de7531fb114f5f…

MALICIOUS

PDF

74.1 KB Created: 2021-09-22 22:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a5432e79b3a3e3b74dea9387cef91fd SHA-1: 609f62d5d42c87d3029626815dfcd39f05e931fb SHA-256: a7de7531fb114f5fab23cc86425aeac24628c886e3e8ece2134277a97a9af7d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7ae0d65e4---zodafogijunade.pdf
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/folobegugafasomapesoxad.pdf
    • http://www.pethouse.es/ckfinder/userfiles/files/dabokiwimixubaxisafufo.pdf
    • http://vizugy.hu/uploads/files/files/34497380705.pdf
    • https://alteanetworks.fr/img/file/favidujidepi.pdf
    • http://uptownchantilly.com/uploads/files/zewevituzulufirove.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161304faf4fc4a---66550543228.pdf
    • http://metamorfozyayincilik.com/userfiles/file/takeluzopu.pdf
    • http://marsalanoleggio.it/userfiles/files/wipiraped.pdf
    • http://jhdjt.com/images/upload/File/46005073793.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8a011de0e---mekitovixaj.pdf
    • https://valubil.com/public/uploads/cms_file/cms_files/72771305191.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161334927d9e02---sedovaduxasulimofufiwe.pdf
    • https://agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/75718058560.pdf
    • http://asclyziarskyklub.sk/userfiles/file/puralevuwurutaso.pdf
    • https://www.tamilsaga.com/ckfinder/userfiles/files/66429716774.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/mejibuputalasopipapaguve.pdf
    • https://www.ijestr.com/ckfinder/userfiles/files/73689591441.pdf
    • https://bhavanarayanaswamy.org/userfiles/file/21049997836.pdf
    • http://fsgpj.com/upfolder/e/files/20210922210814.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/a1a585647e4e69e639a13df8cb9bd453/56772878793.pdf
    • http://eptesteplelek.com/uploads/file/fizaw.pdf
    • http://mizuho-co.net/file/ck/files/vafulaboj.pdf
    • https://kitapkaplama.com/upload/ckfinder/files/jatezagemuduxiwajemuvufu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=disney+movie+apps
    • 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_off0000c0fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FC 16792 bytes
font_01_sfnt_off0000d90e.bin
ca5651dae6e3dc956e583f62d86f36a8211623cbcb47dbb296a540aed3e27420
pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 16492 bytes
font_02_sfnt_off000103df.bin
d4dbe170ef865330074ab85153b41d51d63727b21922e3cc1d208467937968ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x103DF 10348 bytes