Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8ecb3c458b7008…

MALICIOUS

PDF

71.7 KB Created: 2021-09-06 10:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8308ddf5cb87dbe8988cf21f9ae0812a SHA-1: 930bb92c33ebcf22d22d2cb9095eaf37d0a9ec52 SHA-256: ae8ecb3c458b700892c857acbbc2554b993a4e943fc84ce84121092e9b227b50
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. These elements suggest the document is part of a phishing campaign or a distribution mechanism for further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090688c9caa6---jivem.pdf In PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/linulubolujowutefavu.pdfIn PDF document text
    • http://unseretochter.ch/images/file/63850241914.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/97348400380.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/7337972654.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/umbapmb8cq1l5qurjc8k9n03ec/welarasab.pdfIn PDF document text
    • http://susutour.com/userfile/file/xevativixa.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/70010018013.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/68590720465.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/80163893993.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/61978873207.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb9ab1a450---gopepuk.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/nujujogisef.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f8f8ee7e1dbff34bba53ca8bc831491b/fosiwadivojozufozawaw.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/pimolosiguwifolelowa.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bbac4ee36---tesozonen.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/52445157964.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/30479256450.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/85269177048.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f2582bb04---ratonasafadefuxivadafugi.pdfIn PDF document text
    • https://aashianarealty.com/file/kapodunududamijex.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/97389391880.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f252d121c9---48793352621.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce0ff6c7ec---37793366795.pdfIn PDF document text
    • http://ellev.fr/upload/files/46362516406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=operaciones+con+numeros+irracionales+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_off0000ba00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA00 10808 bytes
SHA-256: bfa53eedc44e9a8df05942a41790680118e2c5064eeb1ddf60c5552c1c5e7565
font_01_sfnt_off0000d2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DD 15028 bytes
SHA-256: 1a2bed39675d3fc923c4be1c27ea2b9e5bd2400da954fc3e98e2efe1f16b3092
font_02_sfnt_off0000f83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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