Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3eb7ddbcb3939d…

MALICIOUS

PDF

107.3 KB Created: 2021-09-01 03:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b5b52a07d5650623e7d06114ad55f68 SHA-1: d5e54416cfff2d3fa6e67d6b9bbdf06eab61c8ea SHA-256: 7c3eb7ddbcb3939ddf0035b60aa6d53d3ae160815f194dd183f1e74b9dcd85e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious sites. The embedded JavaScript suggests an attempt to execute further malicious actions or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9677

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 https://pixomot.ru/uplcv?utm_term=early+to+bed+early+to+rise+proverb PDF link annotation
    • https://lionkingbali.com/uploads/file/tusevusox.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/48247524893.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/sadolomeve.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073b8687b4fd---bukaj.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7f999d40d---zuzesetobodidabolonukowa.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/dbd29a3ecc8c109ebc2891a6d5394259/funiwekezavukajupivozod.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/o67nq3ekngd6e09ugp8m9ai64b/wixividirusujalezarilekif.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5013c7ea0---latumoviviru.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/45473488126.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16110af6ab972e---86811263164.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/c8c7b1d63d2fe95014c7a0dab0bc8927/dobusolu.pdfIn PDF document text
    • http://computerdoki.hu/user/file/57126775758.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/babosofej.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/madazogijikomeva.pdfIn PDF document text
    • http://tianfonmm.com/d/files/97928942576.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/73284783935.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/7pmp859t96dof6mtbvhclp1nt8/28356179825.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/0f2043daea0f93e57528e911d93d4016/95293706721.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/povamubojolobetejebibeku.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160832643c853d---juwasamoxizavujilajukej.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/82580071055.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/nifuno.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160791252a48bb---zajoxe.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/9995087908.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0b2ad7c6d---pozabol.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087dd1fe70fb---lemoxisesotowan.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/wenusepaludigenawapi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B82 10584 bytes
SHA-256: f7eb3e4a4d85db1b2547778cc4bbcd6017f3aeba2472df8a9c5cc660282d9ddc
font_01_sfnt_off00013399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13399 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_02_sfnt_off0001493e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493E 24320 bytes
SHA-256: 1d66a89644ba529fb22ccdf0f59510da8361d7622b18f1ba6267dc72306954a3
font_03_sfnt_off0001868f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1868F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1