Malicious PDF — malware analysis report

Static analysis result for SHA-256 20597e6336f81f17…

MALICIOUS

PDF

81.4 KB Created: 2021-09-14 14:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c8291135f2129517be3e0bb07fc80484 SHA-1: 9cdd221635f34bafa9d8b78106f0928e86efb40b SHA-256: 20597e6336f81f17131b54f7dc7d5f24ffb2aff8d4f73580c277a51d8b12c4b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains identified as link farms on disposable or compromised hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://wangyiphk.com/userfiles/wokitunoda.pdf In PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/26709528431.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613473cd352ab---diletalazolemefokukob.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/40378891827.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/61028581555.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/purexurejogerosibonoziz.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/69181998738.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161376db2571c8---54882380658.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613781767d980---63088704471.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/nanilawoxixegeme.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/rujibolumiwez.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/99480831635.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/67643104280.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/ziparorenitideweverob.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/lo8dgdof6619d5u2i3ug47f8gh/katasupaxalexumevuv.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/vemitofanevefirusibazat.pdfIn PDF document text
    • http://hanauhrova.cz/files/doxunasuvexukujumutob.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/zilixogavune.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/zotunisegatigat.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321e05a023c---sewuzowa.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gezedaxawepisis.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/kumizorisudegirepijax.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/60566391387.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/fasonemezilu.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/napebafidinulekopiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dua+for+parents+good+health+and+long+lifePDF 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_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 17524 bytes
SHA-256: 88b8d8d187078f8bde4f1337d149bd1e21e4602bf2876093de1a4389ecc42878
font_01_sfnt_off000106ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 10880 bytes
SHA-256: a9edfc31f14dfbeef1b15024a2bcf8374735ef6d326025fe9ec285004829968f
font_02_sfnt_off00011fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1