Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a743f9bb642429…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 19:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1daca37f253408aee7128156cd980b59 SHA-1: 46c4568f06f7539ba6e79387afac85da0dd4f472 SHA-256: 93a743f9bb642429dff0133e9a59ad8823d9108a2822577a8935e7d9aa5c38a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious links, which are designed to host phishing content or further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://refpecsbelvaros.hu/kepek/files/64506040208.pdf In PDF document text
    • https://sankaibearing.com/userfiles/files/36599167916.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135f6dd2f3c7---teguligezexujotox.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dfe29fcad---wilatibizo.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109152256033890.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/satudupixagom.pdfIn PDF document text
    • http://baozhaopharm.com/upload/files/mefesizapenokevuv.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/rcq1fh9tvp9k5snvpkpas15nr9/12650873850.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/82608428151.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/fafuruvedovaraxedibob.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16131d6054b5c1---tusuvitabadosulidixu.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/8537946828.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/30746974592.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd3bda8c6f---jetowepa.pdfIn PDF document text
    • http://tcihk.com/userfiles/tukugegusikineboguz.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee8a9a324d---35963331443.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/20991223897.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210907_8AD4881BDD145932.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/sosakomuzonoxunepag.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d97c3af175---80100651084.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9dc3f8f4---13558280911.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/sodowet.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/s9h9lmlu48f21jmg71hjo46rg6/35722355101.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/678255843.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/40772337396.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109050855434429.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/gotawuwikexajip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=top+antutu+benchmark+phonesPDF 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_off0000c72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 10796 bytes
SHA-256: e3dfb3c18fe7df3c83a1d8bbd93c811ba19d34fcdc45b3d56958ef1d07d8a6c2
font_02_sfnt_off0000f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 16816 bytes
SHA-256: 230470e1894c5c86edf3a19c7fae0853bfdf7348ddd49a2d31b4cb225164c359