Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a336af51d19071…

MALICIOUS

PDF

78.9 KB Created: 2021-07-19 21:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f2832d0ea7bcd7741e01e4350d4c200b SHA-1: 9a006975567f9f6ed2cfb2ffb334691b8dc98cb0 SHA-256: e8a336af51d19071871c1e1b1bca2ed743671d47e841e102b568653dac26654d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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 https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/u3mf5h3lk5munoc30np2505bfb/jukegerepatagiradebabeto.pdf In PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c560b868d5ad1d1bc600ba433aadb8e1/68951209505.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/wuzodofenojo.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/waroduvuvopiraro.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02728cc1f5---74516137024.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7bb32c61a---metadosiwepesekekozi.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/98134123540.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab59daacd8a---90913728772.pdfIn PDF document text
    • http://trhs1966.com/clients/b/bb/bbabdd843433c1cf4d3e80624837507c/File/bekaberazawemiro.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/97889286992.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160923b375962f---27857340239.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/texojivelub.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/xezewabogotesizekex.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fa36b0fbcf431cf16d3be21769151ac8/bokimagutekemujas.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/2q8bbt1hq9j6bvgbcvqm4s6mn0/parabomu.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/j7vd76e0nbdr67v3kmd74kob51/tutifumerenanimonituwof.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ls8873jm6h45sc6id1f5sercv0/sujilikivixiwowakijifone.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/udfvm2tve0ro51s2030npjoqm8/99496678024.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/20347302618.pdfIn PDF document text
    • https://isleo.com/i_photos/file/16978350975.pdfIn PDF document text
    • http://berbun.com/user_img/file/nefevulub.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/mu7kadmgpu1m5p50reu0t4qg2q/12126812615.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/bavelaxan.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073105f02103---tefebojolamovilopuzizare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=s+block+and+p+block+elementsPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/11e3ccf8e51c21627cac79ef1b831fec/33734475010.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_off0000cfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB6 17316 bytes
SHA-256: 02e8f85a7f4d2462b0ee4b1413929411b6084d4864bbe53ca190f47377dd09cc
font_01_sfnt_off0000fd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3D 10792 bytes
SHA-256: 547699a77459a23c3cae0220b88dad18981d2fdf93c3183cb0df216669823df0
font_02_sfnt_off000115e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1