Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7416afb8075878…

MALICIOUS

PDF

84.5 KB Created: 2021-10-15 19:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 03c980c4d1b59c57a00ab6973a633652 SHA-1: 51bc77ab3635b5a2ec8932e8029e234308efe980 SHA-256: 6a7416afb8075878f0ec85771475bcd2b2ea78649fecdc7d8e96a157b3aca5d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised CMS uploads. The embedded JavaScript likely facilitates malicious actions, such as downloading further payloads or redirecting the user. The link farm, hosted on various domains including compromised ones, serves to obscure the final destination and increase the chances of a successful phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://candleelectricals.com/uploaded_files/userfiles/files/24691026134.pdf In PDF document text
    • http://arredamentoambienti.it/img/file/pugawidugel.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021962325325013.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/25909544081.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f3782db51---zewekew.pdfIn PDF document text
    • https://hinaweb.com/upload/file/12570523284.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16166291a6efe1---73139405501.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/nujakepatevedakuf.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/77236688772.pdfIn PDF document text
    • http://spharma.ua/files/file/8896018980.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/febunajopaxuxikike.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/45623217016.pdfIn PDF document text
    • https://tele-video.ru/upload/files/sewefilejepalaxajenug.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/43138821685.pdfIn PDF document text
    • https://asiapharma.la/files/files/xezisugas.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/bumobafejovesopovabami.pdfIn PDF document text
    • http://apcmagon.com/userfiles/voxuriwafikomoma.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/88521884156.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/46690861626.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/a21f72c5af23c963fd0d4e9e572e29c9/difuvogano.pdfIn PDF document text
    • https://soechi.com/userfiles/file/taduxotetiruwojomapa.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/ratuzu.pdfIn PDF document text
    • http://luyutea.net/v15/Upload/file/202110324905064.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/zowodosaberufunufuzikukup.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/ziwatad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/cmwvf4RlXg4/uplcv?utm_term=how+to+get+an+exocraft+in+no+man%27s+skyPDF 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_off0000e244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE244 11052 bytes
SHA-256: 9632ca576158104ec218762dc2229059c7652fd53b16a8e3bff7977cd81f026f
font_01_sfnt_off0000fc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11435 18192 bytes
SHA-256: 299159501feae3f6ea6ea0610b6a45417175b450479ee6394d77dd0dd4e15c5c