Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c0068e5a81c63b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 11:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 73049c82383f90f19e50f55d78d6b63d SHA-1: 75c96b8c8578fab5c6bebcb6510980105c023bcf SHA-256: 55c0068e5a81c63bb684ea3f7798d6c761c5ec94960352d58a2ea449cd4dc2f3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to appear as a link farm, potentially to manipulate search engine results or lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=george+ezra+shotgun+sheet+music+pdf PDF link annotation
    • http://ugyvednok.hu/userfiles/file/dilejapakagoligizoma.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/81995056329.pdfIn PDF document text
    • http://palami.by/images/file/37570072875.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/zaveneda.pdfIn PDF document text
    • https://atrax.hr/files/95393783177.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a491885218---fizokujagiwabepofebi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/8912130a84dd28d7e5b47dc4876f05f4/87967116709.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6396c0019e---70453021460.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/62093931904.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/lewewalo.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/95898290520.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vf0kjdfpj2btadjbsbtq4uoup6/1181045028.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/74267189629.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/bedekakafapoginerikanil.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/3aa3f6801cd130a86eeecdf63e0eaed4/8651679913.pdfIn PDF document text
    • https://digireg.com/upload/zinabefij.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d52ec3fb40231ef413939e9f79128e03/gufujosal.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/jexaxusavubapekenega.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/8113108221.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/pavuxeka.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/ed673c17fc631d3ebfb2a4f3501e8459/36512652959.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607792eee4c5e---86694134855.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_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 17672 bytes
SHA-256: 595b5498563a370d93dd8d81333723e26a2076427a5d864ea72c05f720bef4f2
font_01_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDF 11220 bytes
SHA-256: f7f2735cb502f10600119df2a5624a5107279520c04e79afd794935b141eb72f

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