Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42e40aef9d22446…

MALICIOUS

PDF

75.0 KB Created: 2021-09-02 03:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4835ba659383573c6a4866052d425775 SHA-1: c1d10395b6fc2a9a036445ed60c994a837c5fa4f SHA-256: d42e40aef9d224462029624d4cb1de08b1e9fa2bf5f4a3b8382b817ee72088fb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/ffa02308f31ff76bfcdf8eeac5dfd992/dejokaj.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161253709f16cc---91726497493.pdf
    • http://amuseonline.com/absite/userfiles/file/71560945358.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a36cba0a987---rujoxonapijesariliwafuxa.pdf
    • http://dtyxbpzx.com/filespath/files/20210810044148.pdf
    • http://boekenwinkelindex.nl/images/uploads/76197623570.pdf
    • http://realfootball.gr/userfiles/file/rosinolen.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fefbbb652---pebafasakakuleme.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/l9ek7lbaohkodcsffgmbpvbk05/30733194927.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607831639de76---59861166474.pdf
    • http://www.tekkoo.net/images/library/File/sedozonites.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7a2b1b0e---wunebukovip.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/096lrtht1dpebo2pcnarjbknt0/70738200128.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/02f001c4a4a7b460e6ac1ae3e0e20e29/41286466433.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3bb45f0e3---nadarebeladedobipinedari.pdf
    • https://aimtronu.org/userfiles/file/91369144844.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d8ddc062f---wenovipumejuwin.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/d09c4df9ed763f9b67e7648bfa671d90/61951221314.pdf
    • http://php-lounge.de/userfiles/file/79053757123.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084d7432a24f---99590714712.pdf
    • https://soechi.com/userfiles/file/68231182948.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=by+parts+rule+of+integration
    • 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_off0000bfff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFF 16792 bytes
font_01_sfnt_off0000d816.bin
545da4e1b2f341e9f7c3bfbba12d0f603eea7d127e421aa0392a3a20fe599c9b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD816 10800 bytes
font_02_sfnt_off0000f12b.bin
795d3b13d55557fe89dc9dfbf4cad7b86c3735730fd16caebdc28509c63413aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 17144 bytes