Malicious PDF — malware analysis report

Static analysis result for SHA-256 619e524e5c34b1cd…

MALICIOUS

PDF

87.5 KB Created: 2021-09-22 13:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8bca858fea30a39a1831e1ea8a168b53 SHA-1: 24ba6a08cacded37b3ae8d06a0b28db6f5b2f4f5 SHA-256: 619e524e5c34b1cd08b4c861987c5b2d99237851de732defbfe48bdb2f98b572
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest this PDF is used as a lure, likely for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=the+conjuring+3+free+to+watch PDF link annotation
    • https://ozsersogutma.com/upload/files/timejaxemozu.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/95570873555.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ga51h706d3l73s9e5ounpco2l1/poburopafumazuzelume.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/pasotefafaw.pdfIn PDF document text
    • http://sarvodurys.com/userfiles/file/8793019449.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/57a3d2221db807297f557895a16f04ee/sipigefogurixota.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/73086297820.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/31285880757.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/84754841162.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/lenubepubuwuzolujapikubam.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/kogulurufojepirazux.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/kejoruzu.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/xixalezopovowibamuzego.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/4ba99ec336beb36216d2ee272ace5a12/velugotidexeriliwe.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbc6a82f13---wosumebikalora.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/dopumobajijejemibe.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/90262291262.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/gunobibanibiz.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd0a96ec24---25748382476.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e576c04a5---kotaxikamonetixelab.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/tasadowimuzugexelobag.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/mowuz.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/84361275303.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/jojudijalij.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/sukul.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_off0000ee1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 10852 bytes
SHA-256: 7005de8392fdc18cdd6d1255e5d22381a591993a80763a927752b92a8dc609f5
font_01_sfnt_off0001073d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4F 18736 bytes
SHA-256: 661173433ae52f65279359c756b89949c4baba63ca550c76b0aa50fd8704bc77

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