Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a23b72b4612dde2…

MALICIOUS

PDF

87.4 KB Created: 2021-07-03 18:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f338add09adce5dcce32c44d181efc4b SHA-1: c9bad5cdaeed5891c83ddadb844b0e5e5922cde7 SHA-256: 7a23b72b4612dde25fe325a674db8ffce6460836d605021975df8df7bafc9999
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2044fbde0b---34993155296.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fba00e73d---vivuvikawazukusu.pdf
    • http://roocenter.ru/upload/file/ragefolatupogedikikifad.pdf
    • http://biometria.pl/photos_fck/file/41492199968.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c25e1bd29d---69448467736.pdf
    • http://placc.info/up_image/24277062802.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/i33qjovmhln1513fsqk44300o4/jelivex.pdf
    • http://beateromer.com/bilder/file/wariwimi.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/18d81d306acafc31df48adffef890d0d/wazejoxokut.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8bdb1893f97e5ca90ac9e1eb2ffc8078/61970708909.pdf
    • https://service-panev.com/userfiles/ferifizazozegiranakimo.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/29056531261.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/2f2e8dd51d5030db636d4f129d019635/fuxabanewowutavoborezoz.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29a411dd2---41392182082.pdf
    • http://ahcxdq.com/uploads/file/022206335173.pdf
    • https://tecnibat.net/uploads/archivos/59397285796.pdf
    • http://oilmachineydy.com/d/files/44106908969.pdf
    • http://clarksville.net/wysiwygfiles/file/bezifino.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8541a88233---48134076363.pdf
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/57114372563.pdf
    • http://abpaluso.com/upload/file/mufaxugakamitudevobepif.pdf
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/lovuzefer.pdf
    • http://www.clc-engineering.com/siteuploads/editorimg/file/waropaz.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/939a379bc89bef415cff7894436312bf/vudigefi.pdf
    • http://m4krichmond.org/clients/3/3b/3bf4c986be49c21931b3574e72fd8103/File/zevofavo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=top+boy+names+starting+with+l
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f24f.bin
f6091b65e996ce49f45732056929ace5005f21f0839e8ed7464d2da681077590
pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 11000 bytes
font_01_sfnt_off00010b8b.bin
45fa0daf24d5514b02abff155a8f5213bd64e76f2923552736918ea5fc3eb6ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8B 17088 bytes
font_02_sfnt_off0001385b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1385B 16792 bytes