Malicious PDF — malware analysis report

Static analysis result for SHA-256 a034a3b80a73a4c4…

MALICIOUS

PDF

75.1 KB Created: 2021-06-10 04:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 27fb010fe7df3d953208c16bbb60f605 SHA-1: 911264fa3bb4b32dfe5f319bcd7f638794b51d6f SHA-256: a034a3b80a73a4c43c23fbb541ab7928ca4e0e2341353b1ef437d3752dd82eef
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a 'muqabla remix song' title, indicating a lure to disguise the malicious intent.

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://garglob.ru/uplcv?utm_term=muqabla+remix+song PDF link annotation
    • http://thedewakohchang.com/image/upload/File/evaroduxewubibaxako.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f47187167cbae14131927fd86bbf44e8/23283256856.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/fivupozanetowenovifo.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/najuxutojujasilonokaliva.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd8885fcb9---baxepizadamodubavixito.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/xegor.pdfIn PDF document text
    • https://artbynela.com/uploads/file/sezevutoxixubupumofexux.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/julujuxenafenivujama.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/98352a4e52e7555392e20f708cad6176/61481978540.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072cedf35b67---15937292609.pdfIn PDF document text
    • https://retta-bg.com/userfiles/wixumagejuz.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/9010ab92da9d56e1cef81ff43b0706bd/35791567722.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/warutiga.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/768db61afbc9dd008dc301b58ea825d0/xuworivamuluk.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/18929585703.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/33819234820.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_off0000ea56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 5344 bytes
SHA-256: 383c9d3984a6cf32da2f2e777b87b08c48d271dfbea63b4afa1dbacf471d75e8
font_01_sfnt_off0000fc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7A 10304 bytes
SHA-256: 423961b2c3cf8f97aae96d6f60ee859e9e7ce963ea4bd7275af0b2fde15d42d4

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