Malicious PDF — malware analysis report

Static analysis result for SHA-256 f965447f895f238b…

MALICIOUS

PDF

71.3 KB Created: 2021-09-30 22:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 28145a58ad97b750ecfc26073bb802f7 SHA-1: 8e505c0f8ac02966d20db00f7a44c1285b336372 SHA-256: f965447f895f238b387641b495bb5e750bd32044ccfebcb7d402538999a5c203
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to redirect users to malicious sites. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://lionkingbali.com/uploads/file/kegozizidebuxowegux.pdf In PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161468c8b6087d---tovizuredovepopimepud.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/xufejomolowowexatagonimux.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/7357296069.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/70920082105.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/komegitimifuk.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/jinosawulijudiv.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/60399246608.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a9a8061490361404cc305044a4ff9edd/25732986005.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/zonetositume.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc8f91905b---jolabuli.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/574c4fc93c83458cac69bc4dd1c72c27/56509948866.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/71383893530.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/11897178766.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/52992724371.pdfIn PDF document text
    • http://forti.in/userfiles/file/31924751323.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/pinavaledikabewirepe.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/61739494021.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/nadutapitat.pdfIn PDF document text
    • http://sergeybazarov.ru/file/8450105205.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/nitowadibiwurudigeba.pdfIn PDF document text
    • http://didopack.com/files/xapofukitomepab.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/79277061186.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/435c4ffbb693b2c9da4dd80a0ef12347/58998231555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fortnite+skins+randomPDF 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_off0000b584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB584 16556 bytes
SHA-256: df1b9486919f43448d90162d47383b7d467a2d416541996cd5bad2d3929c4794
font_01_sfnt_off0000dfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC2 10432 bytes
SHA-256: 3339964768fd8f9cb328703b23e69f6bc15838b5ee9db943712b5296388660f2
font_02_sfnt_off0000f768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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