Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6f1a7aa80ef5f5…

MALICIOUS

PDF

70.5 KB Created: 2021-09-21 23:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a49d29ae149f5d501b78ff6a2fd889cc SHA-1: bdf81f01f17a879705bbf43c38c9398a14db6db3 SHA-256: ec6f1a7aa80ef5f5c9946fdc15cb17ce5537d8c0f56c13dd24ed4d7d707bfd48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with critical and high severity heuristic firings. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The PDF also functions as a link farm, pointing to multiple domains, some of which are hosted on compromised CMS uploads, increasing the likelihood of a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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://saharun.org/uploads/ckfinder/userfiles/files/wufomemadojogodomoguzozim.pdf In PDF document text
    • http://dunajecbiala.pl/upload/File/fazalanedipusemames.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/5839013605.pdfIn PDF document text
    • https://matricula.arendic.cl/files/64023394399.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139fc5fca69b---99798850567.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/76538450195.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366abc5268e---10809059322.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/leliru.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/lerowizavarekilolidipeki.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/81340728903.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/lajed.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/43528433642.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/30955611936.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/nifazitetotafulinetux.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/fogekamurodono.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/pevidapuxis.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/qb0ip513eqb0vqbhp5uevm8t0v/mututikuwakizofifipon.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/gomiru.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/xejeva.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/93663968646.pdfIn PDF document text
    • http://cascad-trans.ru/files/jaxojanokojomir.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/82467585333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=propiedades+de+los+radicales+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_off0000b3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD3 16148 bytes
SHA-256: d160269179ad25b527b3bda9f15993b3493871ffffd85b376d53062d48f42f72
font_02_sfnt_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 10412 bytes
SHA-256: 717f020fc82538bddc219e795e42e2782aa614b949912735a86b1e6594d87844

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