Malicious PDF — malware analysis report

Static analysis result for SHA-256 af32ef54d5dc38f5…

MALICIOUS

PDF

76.7 KB Created: 2021-09-14 01:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 34284dfbb7fecdaabf41cf330bdcf955 SHA-1: d87bc85c495f89e2542f8e260cd4d088735893ac SHA-256: af32ef54d5dc38f5b8f7b6ea9a66f3011cf4b39062d36e34a56dc7d8fdd5a437
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://garageanything.com/js/upload/files/vonubapi.pdf In PDF document text
    • http://recviem.ru/img/upload/94342571431.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/wirozorerogojurodusiba.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/mikebupaxadumudadetilofap.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/golovozakiwomubuwudirav.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/gabaresunivemonajizomuj.pdfIn PDF document text
    • http://ccsl.asia/files/xufenixerererurotunenow.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/31218547181.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/fidujemovaripobuximis.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/jolaxekedose.pdfIn PDF document text
    • https://izometal.net/mm/file/kaxonemem.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/zevibowivizeduk.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/nisibigugururavujuvarodob.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/22130528677.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/87462282982.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/90071925357.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/64565006496.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613430242f66e---40658249315.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/faxuvikadalu.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbcbf95f40---tosijebibiposumozulofu.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/pefimadizenunoxemefatu.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/fibefepiliniladu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff546e40fa---vutavukoxeramikigizok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=convert+excel+document+to+pdfPDF 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_off0000c788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC788 17200 bytes
SHA-256: 1e241162473e1d321f0f7bb740c8784708442eadfb6fc5a314542faba3b2b304
font_01_sfnt_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 10656 bytes
SHA-256: 23054fa1d959233e8037d86d7d85df6f6f79215db92412c652d92896a8deadcc
font_02_sfnt_off00010cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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