Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f94d4d2b40b5c6…

MALICIOUS

PDF

78.8 KB Created: 2021-09-05 11:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ab6293e7e4cb7364d079fde621e00e9 SHA-1: 65c9bdbe6910103f62d208f9383f74338aee1e74 SHA-256: 66f94d4d2b40b5c6f9dbe4d9dc4cbf39707d125fad1a0907876c4879dc548785
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised sites suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/idd6brne4q80apa8mj3l0ojtgt/64064296099.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160706dba25b59---kexaruwojoja.pdf
    • http://www.gonouvellezelande.com/files/xodimu.pdf
    • https://alrukn.co/userfiles/files/43319395078.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lukc72fcfcm9eom3mbvk95dr87/50487159410.pdf
    • http://mobilni-kadernictvi.cz/files/file/sozamokikilimenobejimi.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f798c4523c4191b01f9aa9c128f734ba/nosepogexewofukul.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/e86b6a86fc74b016be216f269ac3cffb/86076963464.pdf
    • http://abnicum.com/files/file/40095286407.pdf
    • http://rencontres-icare.org/userfiles/file/45006513807.pdf
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/8982994831.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4fd221c52a92aa56c3d24779a877980e/fapiwapadejawet.pdf
    • https://masihpt1.com/contents//files/resusewufiteloxebiluti.pdf
    • https://laser123.com/geektic/files/dajuzejifivomatuzadosobo.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160db8c6f27799---52940501274.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/eopfbpekue3nd3qidf1npgeq46/1400028379.pdf
    • http://thienlongadv.com/upload/files/xadukasifezowekesiwutorog.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/23678656282.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dc5c5453b---32413108335.pdf
    • https://zemiigori.com/uploads/file/43580817810.pdf
    • https://cortopolis.ar/userfiles/file/85968898299.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gabung+jpg+jadi+pdf
    • 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_off0000d349.bin
3e6fe528377301b7db876c8c6deb06696eca1631f828a5d566982ab47c891b98
pdf-font-stream PDF embedded font (sfnt) at offset 0xD349 10416 bytes
font_01_sfnt_off0000ea7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 16792 bytes
font_02_sfnt_off0001028d.bin
5dc207e9cee9e9fa7571e286d24f5d9c7cc4a7a74e6b6335d1cb035b477b21f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1028D 16848 bytes