Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4cc3e8a0bc45f7…

MALICIOUS

PDF

97.2 KB Created: 2021-09-06 18:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4dd2297b0373f6671612e360095e1b61 SHA-1: 5e85b86d39cdb57e91dcf577e1907d28e75d15a6 SHA-256: 2f4cc3e8a0bc45f7d4b5ad2dc6ce0d1b7982b2cc0bb53402abde116cfb6e03cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to potentially compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, aligning with T1566.001 (Spearphishing Attachment) as a likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16129ba20831ec---fuluzino.pdf In PDF document text
    • https://arch.ua/ckfinder/userfiles/files/wolesolufafosig.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/55546586864.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/metawifesiwepisimirivujux.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb91c8a6476---75111664824.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/vesafa.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/jofavajotuxamapojuwejomod.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/65074414092.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/6bb99c92d43830b5a94bacacfe754527/lokexepilid.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608338052dcfb---pesamekoxiwulolenirobe.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/tivajej.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/44031982836.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9ko2915ir2gh081dg52dtj2mu4/81756511385.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/77276728598.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/pd0ptnt9j88vnn5a6n1tiilar6/41973786936.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/s54g3fkaj62kr30rf6a096mluj/63052277439.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/gigozozawibekiviles.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/11513107535.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/1079503898.pdfIn PDF document text
    • http://lyshiying.com/d/files/62418889983.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/30209936525.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba36ea599b---42016967142.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210819014224.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/91531973057.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/wufowoludomiraramuzoze.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/babuwesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ragione+e+sentimento+pdfPDF 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_off00011608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11608 18316 bytes
SHA-256: 8c21c466bd62bf514d0ea6dfb3543a90227c1608c9b1faccbcad1ebb562d0fdf
font_01_sfnt_off00014646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14646 10740 bytes
SHA-256: d2b863cda6a33f31030669ceb2b507d7083fc32d5affa83cee0290a30031d11a
font_02_sfnt_off00015ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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