Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa79b46aaff5ec3…

MALICIOUS

PDF

87.3 KB Created: 2021-07-01 19:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7486121cc9e1967decaf6756d699d75e SHA-1: e1d7afa5d44e161929a4f38d1571aa696df04ce6 SHA-256: efa79b46aaff5ec39fd497d27146ab2e42d38e704a4ae9617bd53e65038552af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=real+madrid+live+streaming PDF link annotation
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b164ab9372db3ffb04571ac0e2d3e4d3/negidazekolufak.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/814bvv74am5mo28j39vtktidb3/tofiwodekiretejuzesarifo.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210519125056189.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8227ac039e---pemam.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/lorawogelekujoni.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/tt87197h64h3ruk14alg20u1g4/gosivoresozonopapo.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ea7e56fd2---84716634512.pdfIn PDF document text
    • https://tomas-music.com/contents//files/fumowakujanukadugizisolan.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16091421892b45---kegopamutuxugabivibub.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a308dd77ae3---jozamezexojil.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/29487064724.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/senedevaruzidexibared.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f627f0c53d---niralivije.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/952f567002c8e3a197941776dd15fe98/bidoditagagaxeleluva.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/80364238938.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5c4e90cfc931bf78231a7ddac4117230/lamadakugefimovebugu.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/4269191256.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/67803960206.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/39465474060.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/8qsb8s55v30j72i1017to4c33p/zejuvegoz.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/lunopepado.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/rerosewugiruwovezobamasu.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/pujesebipizogava.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/debodurofomub.pdfIn 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://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_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC1 17152 bytes
SHA-256: 200a76f31c551369e0e99a233d22e36bcaac7ce0fc4384e25e0b0e1fadb9d6f7
font_02_sfnt_off00013867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13867 10580 bytes
SHA-256: 225340dfe15b4e833879b4e19ebeb36199bd79ee95a77c6d3c1acddee8f882fc

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