Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5afe9a952e05172…

MALICIOUS

PDF

111.7 KB Created: 2021-09-06 13:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fef52cb2abf467e91e1be6c1f53ab487 SHA-1: edea264ddc22b645c083be6e3f47a6d0af048002 SHA-256: c5afe9a952e05172ad1e8df6efea2b976e95f8e535c36480d45921dd8c1728fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves exploiting users through these links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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 http://www.solarwindependence.com/ckfinder/userfiles/files/41360510932.pdf In PDF document text
    • https://twr1115.net/files/fckeditor/file/bajaviribito.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b644383fd---kewimofefokaz.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d5dc4b1e12396c943f44d42085827bc1/56275373174.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/nalugizetisowo.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/jodifipadivenunozemagura.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/82889556600.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/pije9l8aaa33fq3pkch0aj36ib/guvefediramogegebopilev.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/51134067754.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0fb21966e---76036903059.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/15755072902.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/64583682481.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e5895549166e0f2eafb586c6cb5006a8/95723018284.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16100e9ef7e08d---kotesipatukuzi.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/fejowawopakanusib.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109060529546098.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/fc4d03f4206f6f00c0da205b5bb36c4c/95609569722.pdfIn PDF document text
    • http://ukuleleceilidh.ca/clients/860383/File/pewavaretakarov.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210905_9CBDCD06C9314C47.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081389a699f8---158717569.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/norepudem.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/pazigasalepavemivuzunudi.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/l5ilmvgctvtqoih5k9gq7oc506/mazebafesodosupomajunag.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/phrfihidu7gcer1n7rp487brg0/vajakarusawebuzalewodofib.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/70292420862.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/2710118882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=southeast+states+and+capitals+quiz+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_off00014fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA0 18416 bytes
SHA-256: 0c034ad552ba405705d5187fdf31b13cfd5fbf3d3840ec8ae1847e0f09f4cd08
font_01_sfnt_off00017f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F72 10996 bytes
SHA-256: cf91ec70d46b1d343cd4b09ac40db81843d7327b43ee53eb870a9bece79db0ff
font_02_sfnt_off000198bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1