Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae47d0dc497406e…

MALICIOUS

PDF

75.4 KB Created: 2021-07-21 02:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 50ee189b9fc0492201b25a33317f42ac SHA-1: 9c46015b7c3ba5e35f0034598853f8e938f1bbeb SHA-256: cae47d0dc497406ea46c3cf221e0fa2ff7eadc03c471ea28150ea0f23727990e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://gamaconsultores.cl/upload/file/96361852867.pdf In PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743d1f93cd7---xibeles.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/f6f100.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072006704b0f---76441850321.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/47467416136.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a625b9b36---mixolidonevugamuwajubuviv.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/38949250093.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/43691817605.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/1fc77c0874ba2dc23e142c9a57a41296/jalogunepawunugakepejev.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a3b2ff670b5091a006e133abe546fcdf/ridovubilezarefozitenubuj.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/61423354875.pdfIn PDF document text
    • https://eternalbliss.net/file/42962810312.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b3a13ccc1---zanexibanigopefek.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f19a9f181b---29245892445.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/wozorovegabi.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/kpk732p4347fnp1a3eminf2on4/3390008434.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5nv4jideg5dsgdpoaek8kdd18f/9712796388.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/71271376196.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/67179219523.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f9125e79016f9ba321ef96328afe6b0f/87755386075.pdfIn PDF document text
    • https://magatek.com/documents/file/41456612808.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfebe42c291---xifesujesa.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ds25ag6361tjponve5l35c4703/81182671014.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9ea4ae6b247e8c53222e57ecd8129356/53981710973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fireboy+and+watergirl+hacked+unblockedPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC488 16224 bytes
SHA-256: 31448d76fdc3d28690eda0ba1972c0daa5d5ab25cae06e71a8a8246e91575ef2
font_01_sfnt_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 10992 bytes
SHA-256: dcc040110fdc57c27cb1066ac1c3785e22d8e45dcd3ba51e70df38a1943d147d
font_02_sfnt_off000107df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1