Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf39c50ab813e444…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 14:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f799e5cd19b90b55d43be9611f2d20a SHA-1: e239b8192d0d7da634b1fd905cfe8a951ae2b6e2 SHA-256: bf39c50ab813e44434c7096302bb99e2a83b6bb79bc3914524d47520df4a3786
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. This pattern is commonly used to distribute phishing content or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b5c8ccb78df423fc2e1b156695090570/76637249028.pdf In PDF document text
    • https://kisikana.hr/UserFiles/files/86284392317.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210907_037DD05F2306A098.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210907_203426.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/86559470838.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/77188246215.pdfIn PDF document text
    • http://otczenacts.com/media/files/mufagupaxetisokaw.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/9194994d9650b6d0d3a14584422a8199/2821720018.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/4841291170.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/12271038858.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/toponekirusoxibebaxivelat.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/9618703306.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/nukowajodeforulobino.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161382c5102988---88669173714.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/63413004117.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/tixuwuwuwufumuderelunel.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/vozagev.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c59eace48e---73436321993.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/lirulozulatewamagovo.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/sazijep.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/17305919944.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/batofosufawugadazusanu.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/ziwivalarutigil.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f2910f6cf---devurezumidogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+tv+steam+streamingPDF 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_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 17416 bytes
SHA-256: bdbae608e9170d82d56983adce4552c06a7e5ab72d893da16290e8be6d2216c6
font_01_sfnt_off00010aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C2 10592 bytes
SHA-256: 0817d8cee1f3f3b91f1f1e8af9d1973a32ee8a7c959d99e6f66e1df712b2f709