Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f95e934fb3eb95c…

MALICIOUS

PDF

73.9 KB Created: 2021-06-23 20:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 98a7a16773146466c86470afbfe93a3f SHA-1: f6f378fcf4e9e73e59923b7f86b5c15a6e56b797 SHA-256: 8f95e934fb3eb95c7c9f457ec1fbf5f94675e862f03e9cff714565dfe3295002
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=we+hurt+without+moving+we+poison+without+touching+riddle+answer PDF link annotation
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/24469dde813068b446c58dbace79691b/1154975117.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/927197a5e4fd70f9f834ab12c7a5ed18/vavisemebarolonadopopiv.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/fidip.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/22892312058.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bee04ea0224---26489228608.pdfIn PDF document text
    • https://pathakpharma.in/singhania/downloads/file/nubutebeluwikojexovude.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091c7464357b---76762057247.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ec7f08c42---7406226081.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/xosatunozubin.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878dd66343a---liwosilafonojovit.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/filoxijowoxibaredumimaxo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/b34ttndibl7sfrtl1r88jp0nl0/dawiramevebijegexewiz.pdfIn PDF document text
    • https://x-software.cz/data/file/wagekegabapular.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/lonixod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00B 5652 bytes
SHA-256: ce43d8d88afc35a90864d0973079474ccba24ce6914ca92d4a8555e5b8405b6e
font_01_sfnt_off0000f33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33B 11640 bytes
SHA-256: be9f81fc828254f7885c6c10eadd8c529b891f74f2a2a08c0cfe3697d11ab0f2

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