Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdfbd46c812577f…

MALICIOUS

PDF

96.6 KB Created: 2021-06-26 03:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ee1f88156653187ee36713865c22e8e SHA-1: 19a9538066b5dd934f5bd863ebc7c9081dbc7ac4 SHA-256: cfdfbd46c812577f00ac085342bbfb554f00cc38147e03b9b236ff276b48dd48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/feb09bfdc300431d132d4324f203eba9/64721414766.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/68c6fb3ebe0ba8cee9c2df949af60f99/80322849468.pdf
    • http://enjoy.sk/editor_uploads/system/files/42785732497.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f162066b7---17311061926.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f3e7792e7f8a68fa7170da3b3d0e269c/fetiwipizuremoxezimome.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9698861da7---dujozupim.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/5433b16bd3925f68944604bb5c94d1df/mujokuwuvijewanoxitelaw.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/2646d9db9687fa46ce66ccfe56d059dc/17212450118.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/olr61pvrg4bjsumg8bv0r6i52u/tunusujegewipogudadavumin.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d519a28659---99632341922.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/bdc58348b3b7d8427c4b7b24927b00eb/vubalerasufovum.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6202b125d---valedudazowibo.pdf
    • http://alexlunacoach.com/img/editor/file/wovigefavafebemeranogugu.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c924f42b381---movajisado.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16075e10dded90---50325326263.pdf
    • http://musikpark-live.de/userfiles/file/marulinidosumejoko.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/87db998cc1561ac6bdb335639da17016/bipakegowukesilowelopon.pdf
    • https://laatjehuisweerstralen.nl/upload/file/71569049575.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/mb7cakonq64tf3076kvk8l4ij3/gagelawufawipuwebitemim.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/5fkoj72ghrf1m159vsi0jkfs0h/tegobibamu.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/pagovukebirapijisizor.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/5b3db5b07bd5085dc0dba203bc47f57d/gutewalivuvelisisepezebo.pdf
    • http://agcslohian.com/userfiles/file/854060042.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/1b354125d68573b8dade1b294979e020/vobis.pdf
    • http://osc-pribor.ru/products_pictures/file/rabaxuxuledizenezokoxaxil.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=simple+present+tense+rules
    • 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_off0001185c.bin
7ccbb8898ca6581fffb14b9a706ab600644a52639c15662e17f68421368756bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1185C 10304 bytes
font_01_sfnt_off00012f7e.bin
d4c5c707d620f73e1d644a79d08374a2949dbcb1e93e21cbb9a413bc6142bed2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7E 17588 bytes
font_02_sfnt_off00015d4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D4E 16792 bytes