Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc57f36a6aa4060…

MALICIOUS

PDF

86.8 KB Created: 2021-07-15 23:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cf5cde49eedc6140139ce1fdf26644d5 SHA-1: 7c12d0b2f55fb53d9d11036d7dfb53b0d80e1949 SHA-256: dfc57f36a6aa40606c3ca584461a38d53d22a0c8adf88911ad8092da8b460bc1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress installations and disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=independent+online+booksellers PDF link annotation
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b8b6a463aeb88a0f8f79dbab93b9148f/xepoxixetodeleni.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/lokejigijojovifubuxuseku.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/p6e66ioi9gb4ma02771veu6m2l/73895681371.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861897e96e2---22568860751.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/sagoli.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d925a12ec5d4cfbcb0ebeabb6fcbbf64/91069777766.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/rawibituwaz.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/dasudo.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27969598d3---melupesigowujusefozivoxa.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/67029395086.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cccf9edd0d6---tobiwoniwinojajogizide.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16086de24c2cc8---vuwotexowobebudakifetor.pdfIn PDF document text
    • https://inncredel.com/uploads/85562700101.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f71acaab6e---69725329608.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094a04827cb4---924429708.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16079d46633445---jazazeputitefinexegawaros.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/27457174497.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/84b32hnoa96aij4stmu5aqvpq2/98429111900.pdfIn PDF document text
    • http://shosholoza.de/file/dodetuwixu.pdfIn PDF document text
    • http://belst.by/upload/file/64714832374.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/2777851733.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/togekekepapademebikubu.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/52539720534.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/67507145006.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e19a022a2ba14a9965e7feba7056300a/60344590538.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052407173773.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_off0000ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001077b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077B 10404 bytes
SHA-256: 37e0f82a863fb12e41cd48ce2f3f4da4e616d38d8e7b3c4fb8a556c8dc8717e0
font_02_sfnt_off00011ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECF 17716 bytes
SHA-256: 49514cfca801aa0596fa282f10eb6dd31267199aa7fd9a979ffb92668e11f5f0

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