Malicious PDF — malware analysis report

Static analysis result for SHA-256 e057b2e424555ff1…

MALICIOUS

PDF

105.6 KB Created: 2021-09-08 07:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7510cf881b886542c7a86e64812821c1 SHA-1: 406bfafd513ce2d0303ba2494820e48fbff47179 SHA-256: e057b2e424555ff17647e6a9d098a6fef927c57b31bf5567ac942170873f08db
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple websites, many of which appear to be compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073515e1808b---vorozid.pdf In PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c562bf3ddd4---ludenodolezuvelemu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/62e75a317dda4a9fffb0c68c9c0206b2/rasaxow.pdfIn PDF document text
    • http://le383.com/uploads/files/luziponagawowimowor.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/8903465036.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/memaxawubirilizosuv.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/bofpjg6ltgp2o32odusjq6g9l9/tedonigafolibuje.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/19944599085.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ba111c8f6c77115803be24ecea894a41/pomesuxakijoxi.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/5pusfs7b8u8hohpcelckv29rac/84665229589.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/getijofekojovil.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/21376288155.pdfIn PDF document text
    • http://creationart.hu/files/file/94314050284.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc65ed6e052---31203393935.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971a7390745---8407071514.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc0055c6ba---91504105739.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/85180624425.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/zawurinixotajutujud.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/mip098m33qv4lnj9uq9ba4418i/suliwi.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/darutepagobuwoxewusurogam.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/nuzuvijugis.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/kamawolije.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/70210844572.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/zafadejajatuxamuneda.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/55130676295.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607210dd1f12e---nazeso.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/wofag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=morphy+richards+9+in+1+steam+cleaner+manualPDF 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_off00013337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B49 19180 bytes
SHA-256: 35d1863c19e1ec60c6fac2ca151370a89b8162b8a5656b58cff966774c7c6e5d
font_02_sfnt_off00017d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D69 11204 bytes
SHA-256: 491f49fd6d19b81f5ccfbd9c59b6153cda94dd112626107fef9dcacc4022dd67