Malicious PDF — malware analysis report

Static analysis result for SHA-256 092d2342afe4f9c2…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 04:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 76611fb485798fa8ca7fa154cd9d2ec3 SHA-1: 4dd926a0271c775929a7449e73f0f02eae0ca68b SHA-256: 092d2342afe4f9c25a3971f501fb79fcb905d3d7ebb5ee27c71662f61107df51
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 URLs, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. The document body is unreadable binary data, but the heuristics and URLs clearly show a pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/3d479a40a70a8c3dd1ebc8c9dee4401d/rulekuginunavinasezu.pdf In PDF document text
    • http://myblindz.com/fck_user_files/file/28991860662.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/52091193101.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe4461103e---vewerilowijivize.pdfIn PDF document text
    • https://maintogelonline2.org/contents//files/57083364445.pdfIn PDF document text
    • http://proxima-design.cz/files/file/xokezin.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/65741685591.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/lujijipugi.pdfIn PDF document text
    • https://hgb.se/filer/file/41039605559.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/60724093226.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/62695795892.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/96255695911.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/37b8612ac5771482d421bc818750ddcc/suwasaragisofufelotexet.pdfIn PDF document text
    • http://atomleasing.ru/media/File/bululumunijapedetojupud.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/bexoxumuwexepub.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/livovus.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/xibaxepilafede.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4542c86582---81758207932.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pepudix.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/51b678a859067381e776063f7e4b38c0/nediki.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/fevor.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c349265f997528ece8a9d555762f7af6/pilanavigubezomed.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/damobewufutuvogujif.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202108251812144014.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ugq1rj7cirnn39dmj2l3lc0utn/26019408251.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/21108048503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=prefix+and+suffix+worksheets+year+3PDF 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_off0000d2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E2 11072 bytes
SHA-256: fa933576a3607ae8c84d7a695335afb7bca8e26800ce0a1c73c72eaad2d7e044
font_01_sfnt_off0000ecc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC1 18396 bytes
SHA-256: 41cdfe373608c61afbabeb3d39a507b5b365b0a1ac03b55c5641a840ca7289f4
font_02_sfnt_off00011ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1