Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4feb48e5d82b26…

MALICIOUS

PDF

82.1 KB Created: 2021-06-30 20:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6de8b2dc5f89fab5cba3534abb3e1724 SHA-1: 81ea299f3c313b032e1803b3167de5c5c39828a6 SHA-256: 9f4feb48e5d82b262bd4b653446a3d87506afe51b7e3d87261533e8d646988db
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, which in turn host more PDFs. This structure suggests the primary purpose is to distribute malicious content or lead users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/7d0c84kptt8e9a98936c10med1/16257153642.pdf
    • http://cocoal.com/uploads/file/migexunipapojiguwolojun.pdf
    • http://originalcheck.it/public/img_admin/file///56253158287.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bddd2d2f59---67711255620.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/eoug229r1kq1grfdu9u3ebdsk8/70297811340.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabc34daaa---kaxapusorimopimuxeduw.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/c9891c5a6f0635c55d6b6a57c95f996d/21488160791.pdf
    • https://ayurvedaemart.com/uploads/file/57818900303.pdf
    • http://phuocthuan.vn/images/pic/file/75720826750.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/1e00ca4990e7f7e9832df91eee52fdcb/79508264289.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/a5n5hbngcnbln817q50n44g0sg/lagufawikoke.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/d25c75394bb4744cb4aa3f4d2dcd44e7/78468122551.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7bd9cddd9---14815076259.pdf
    • http://vksraja.in/fckeditor/upload/file/97272211937.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/0gnch6nndku0r0hrbkh7jea9g4/63621995442.pdf
    • http://giadinhlaurenso.org/upload/files/loreruguzirejovube.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9ea092f9aaeefd19f0eecd1bb13b291c/54339102446.pdf
    • http://wedding-ideas.ru/ckfinder/userfiles/files/sejefuxibiwufelagutelegi.pdf
    • http://lucann.com/Upload/file/13255013059.pdf
    • http://amirafouad.com/uploaded_files/file/manunakirazefiwajabu.pdf
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/mumoxore.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/33944201484.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/e6e3bfab16055f51290109a380a9389b/58570486297.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f17ef6d952fea520ef77cc1af1f694a4/51665738412.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ff9+rom+download
    • 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_off0000deca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 16792 bytes
font_01_sfnt_off0000f6dc.bin
e896080d59fab20049eef4bfbfe2fd3219a4b45a490c2bb6af91cb8f2639b2b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 18052 bytes
font_02_sfnt_off00012483.bin
ba2ce3b8e82addd4ed836dc01b5a18748335eb1a954ab076d966916fb491e781
pdf-font-stream PDF embedded font (sfnt) at offset 0x12483 10256 bytes