Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba6d5a862f25830…

MALICIOUS

PDF

97.5 KB Created: 2021-10-09 20:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6014143181d947f9e8c1e3e38523c40c SHA-1: 83c06342d42d92f1e8c8aaf5324257347bb1981a SHA-256: cba6d5a862f25830ca78f9cbb17b748730b338a08d40db00439d5c4ebf29214f
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple PDF files hosted on various domains, including a compromised WordPress upload directory. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613eab5e461f6---9135113182.pdf In PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/tovebesimamow.pdfIn PDF document text
    • https://reha.bg/content/upload/file/27529645862.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/25414366616.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/gokojujejure.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/kuxelikovovur.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/runokakimadezomejoranobug.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/cda1816783ad36ef97e7677c0ed7799c/muwisilegogimivipokubajon.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/fomoxotenimoj.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/62487885824.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1615ca5068886f---welonojeziz.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/diladepi.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/19121359645.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/binudebuwosijoji.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/64476957770.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/82077807096.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/17768994255.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/63092549592.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161382aa50bc89---zigiluse.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/dudekilu.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/mubojej.pdfIn PDF document text
    • http://dominant.name/userfiles/file/jalimupisesabopezujuxug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=most+famous+beethovenPDF 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_off00011589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11589 19688 bytes
SHA-256: 74deb1a89814de41cf6df781add8c3986d9cea61dda7f12ce27fa9cadd76d212
font_01_sfnt_off00014846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14846 10540 bytes
SHA-256: 3a2daecc29caafceaf0271698a73e80f4aac434643e02209716b0a412978706b
font_02_sfnt_off00016039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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