Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0dc5892f3024bc…

MALICIOUS

PDF

89.7 KB Created: 2021-07-02 08:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fe6e310595c7dc7cfefb6f87052cab0e SHA-1: c496f12a029d1702836d8be8470b3fb71852d4f0 SHA-256: 9b0dc5892f3024bcb8dcfdb8b86f0109971e54278caaa6b5f77e91a0e9d40a3e
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress installations and disposable hosting domains. This behavior is characteristic of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/gbjueme6o7c8cshh5tni7q6h87/tawexubipovame.pdf In PDF document text
    • http://peneleos.pl/userfiles/file/38867281073.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/m413mdk7lvg3s3gkdq3gft49ep/4867909262.pdfIn PDF document text
    • https://rintrans.com/files/64032371433.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/zegapujiverek.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab52db7b0fb---bowilubupumudexitek.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/dugavepaxevufanesuwodek.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/makuxabizev.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087942ac6fe4---devilemakosusiniwagi.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/matodogofolubezer.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/38dd181de529fe6298b1dcc74ca994be/65590251950.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/zolatel.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106160030467594.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/183bae94115b2658819b4a5890470197/xibapoxona.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc0b6ae235---purakokirudamop.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/podamuzavojaxogejof.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/jggsj31lvmllo8v4pjqlte6erc/vudojatabipigepizomej.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607de871da2d2---65881535612.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/42084307137.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/9665346400.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/gunazukimedewibumofejub.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071ad2beab2e---niserefovolapub.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/gmh9035bugtntcof6ojsnbdbg1/gatipisazoridag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=parkinson%27s+at+30PDF 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_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 10344 bytes
SHA-256: 8aaa5b601da52381df84e26d298faac7e20d10151581e2f42aedaf26162f818e
font_01_sfnt_off000115af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AF 16396 bytes
SHA-256: f33969d1a6a0bc176579d72abc61d0e32a71be66f761bfe2f5e8f3313e54a3b9
font_02_sfnt_off00014047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1