Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6b1f1ff0ed2ec1…

MALICIOUS

PDF

74.7 KB Created: 2021-07-16 13:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aede4b2ff8c48caa5b044427f4435eae SHA-1: cb8972f106e4d3817b6560ae593ef201e11a2ee6 SHA-256: 4a6b1f1ff0ed2ec1c147f3128c4395aeef4a17ad478ec009f3b77ac676260b7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088473077628---72203283450.pdf In PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d7309db7d---75952566385.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609862539fff7---31879360857.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/17105713071.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/d73a04360845980cfe9c220af988c7d9/zasino.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16091205ca89b6---30473625910.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/23657588326.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/0170be5ec49ee96c807a254c7f30f2a0/zejanigeforines.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/30975904545.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/75533337739.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/a7sd1aj0u1b4nemdlao9euf4d4/worazabezuliduzav.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/zimizubuwivakijazazen.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/84840890867.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/gq835rli1pt600sqj7qa9hgve5/wodutaxokesuxuzobona.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d66badb899---78363597773.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/gejekofimawavokaxituviw.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/71571290850.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/cddca028eb820a21e4c84c9fb572bd6a/basatagesod.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/vivusumodoviv.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/lorurogulomafe.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210619225654100.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/9srgf2akku5hi69kvkimhhkepo/67195024214.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/19588438025.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/wopiji.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607604fa9e9f4---kojubapi.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/sutusitenujapamoneruv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tokyo+ghoul+themePDF 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_off0000c2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D6 10196 bytes
SHA-256: d780bb5e4954161c459fe54a0846007cc2f3fc0eb603470feaa686cb766316b9
font_01_sfnt_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 16904 bytes
SHA-256: 4199dddd44403e3e06ca85b634b33cc7bc0fa82f23d29472b1775093fb5aa8a7