Malicious PDF — malware analysis report

Static analysis result for SHA-256 f498599690797735…

MALICIOUS

PDF

89.2 KB Created: 2021-09-05 04:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ae05bfceaf11305bebaff6d800a9a0d SHA-1: 9f6f50c06836c1edaedfe0b76a3914be18ca2c61 SHA-256: f498599690797735e1b3879f9eb01cb74099fa1a6e9872a5ee174de0e37afb70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a mix of compromised CMS uploads and disposable hosting domains, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://oniceh.ru/uplcv?utm_term=k+means+clustering+numerical+example+pdf PDF link annotation
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/a92d2191a3a24b9c57586fb68bf82df4/rivatiforemokepikuteki.pdfIn PDF document text
    • https://curvy.tw/upload/files/buzufuzisovamijibixaweg.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/bimetuwuxevivudetuxed.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/23599548010.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/oalo4oedme6jcocitvse4or3gp/libafibeguvuxizovizokor.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/toxefoganovev.pdfIn PDF document text
    • http://chikatere.com/Upload/files/36327983416.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/levekujot.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/3c25a6fb184cffdb80af4b93369b8519/kowiragiminujogiwa.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c0f28d5d8---kejapoxunoloxemerafu.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/jeriviluvanemoritoz.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9552157c01---16213408331.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16dd74e7d8---zutukiveganafid.pdfIn PDF document text
    • http://954move.com/clients/4890/File/56987342679.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/13740822587.pdfIn PDF document text
    • http://tfforming.ru/d/files/10948978410.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c069c1d765b---36646235109.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/177bc3d89c51e00676caa62e4c5144be/tutonigiwulubunedakam.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/k99cdl451ekifl5usj71fa2b2v/tebefupakoxute.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/27883641161.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/wuxozorizeri.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/ba4791c9366c70619b31db133e23a748/44182229853.pdfIn PDF document text
    • http://sjhtractor.com/d/files/garawofevuwaremutokore.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_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 20128 bytes
SHA-256: 18ab3aaf348fed4dc4447c992edfd264e384f6115adde96b8b8667ae39bbda2a
font_01_sfnt_off000125f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F3 11036 bytes
SHA-256: 2e78150c03f75731b9fe1f2121e05cd4f8eeae9ba4976f84084910f5242a4e4e
font_02_sfnt_off00013f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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