Malicious PDF — malware analysis report

Static analysis result for SHA-256 be958c133b3376e5…

MALICIOUS

PDF

83.4 KB Created: 2021-08-18 05:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d4cac81ac60d0852c9587c295b81825 SHA-1: 3d69515df2fcdb865f17d08955c84e8d70ee01ba SHA-256: be958c133b3376e547a72f9c1ff83425b86db7bc35eee6445b7518dfb1ebf470
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. Multiple heuristics indicate the PDF contains a link farm pointing to compromised websites, likely intended to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to deliver a phishing or malware payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://coretry.ru/uplcv?utm_term=ejercicios+de+costos+resueltos PDF link annotation
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b3e3e1fc61---laritemekenolit.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/18870105177.pdfIn PDF document text
    • http://sdds.be/userfiles/file/19212228371.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/92314498813.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/zuluwowagazixaf.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/getalogijefijolup.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/guzoxifodutagexijijapex.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160965ebd7c263---76690704333.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfb71a89d---37369365420.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f4206070d2f51336923aa12ae61bcb28/vamumabin.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/tuwafowejibunudilipo.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b24192bcf23---21307546485.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2105271741330061464vnrj4.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6f2f26622---99961247339.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a647ab46040---30489198680.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/doxaradapi.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/69625678056.pdfIn PDF document text
    • http://lblussana.it/images/file/71705657591.pdfIn PDF document text
    • http://eternaseguros.net/files/files/potimefexazupidoxaxigab.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/jegowivesulikalorunov.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/20133e194757c76f6edc5e924597cf91/wodevu.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/35319954164.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/44624282771.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/godajewanugat.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_off0000deb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 18400 bytes
SHA-256: 176b439761c84abc9227448401f39fc8b88af639f5fce5f6593dd6f17c5288e0
font_02_sfnt_off000125ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EF 10312 bytes
SHA-256: 18b3847fb4da51b0c3b5e8ec91d7133a252d6dbf3c11973644e1a0a573520189

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