Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71bf3e2915e577f…

MALICIOUS

PDF

79.6 KB Created: 2021-10-06 21:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 96c89a2ec5cf42ca047df825ca741a5f SHA-1: 4ac32e8db9e2057f068adcb67603b8d0b3e26c6f SHA-256: e71bf3e2915e577fb3bcf495d19930c0ebe8e83f1d7825e008006e83f31c4d30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=types+of+codons PDF link annotation
    • http://sicilalluminio.it/userfiles/files/43769485310.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/dipumemuxobeletobozaput.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109110309465930.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7335a3823ddd9f8dc494560a60189e4a/56288529268.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/vasuxuw.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/1022209113.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f91302ccbf---77944050855.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/85309494396.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/49463885006.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/42793122120.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/35830404524.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/25116863811.pdfIn PDF document text
    • http://hadt.vn/upload/files/39980342884.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/85214576506.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/rigaxiwiresosukiwar.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109270758006910.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/b072a989771d57815bf7a3b1c5642a1d/wuvavajukuzixo.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/durugasig.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/nogikelu.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/70378459296.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/36279583867.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/xiketopawumota.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/dovus.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/vitirewixav.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 17924 bytes
SHA-256: 1ccea835d3747496a228c8f1d80b937cd89169ae89807bbfbf0df9115fab464a
font_02_sfnt_off00011a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5C 10192 bytes
SHA-256: ad944830beb3a8cf8fffc715959d84565aa3af9565617031a1f5f8bf55c7b329