Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72b24dbe7d82f11…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 20:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bf697f8f088ccc53e1b7151cd96e78eb SHA-1: ad5fede5c51c7bf6cad33054da581e686c43ad4d SHA-256: f72b24dbe7d82f11f224d2a188137d5694e326441b6da3cbf0e2be82619885da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised websites and exhibiting characteristics of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161312a83943bc---gabepakad.pdf In PDF document text
    • http://ingpiazza.eu/userfiles/files/vulilesoxuw.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/312eb4bb0c54dd94d388c8846204fa2e/9345981912.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/bulexuvunovutufij.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/92372017268.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/wemoguwewupudasetobe.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/kifopurejuvox.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/16010747841.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/pitagorurojebavijejujo.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/puwipozapokutopif.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/87715419018.pdfIn PDF document text
    • http://www.siposferenc.hu/html/jatebetorakubofubizusosu.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/fuguwomafovoradumeloto.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/39830664104.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161405f7c0edf3---86671405038.pdfIn PDF document text
    • http://cartopack.com/Images/file/73720671217.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/dopumalapez.pdfIn PDF document text
    • https://slavicchurchmississauga.com/fck_upload/file/18754264750.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/550723399.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee759aedfb---labifabamuxuwoxesadetaf.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/16018352684.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/dutedawekinipe.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/39525295874.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/45254819152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=car+cheat+gta+5+phone+numberPDF 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_off0000b01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82D 16352 bytes
SHA-256: 43c0b47ca4e5ae6544420339c57a5d1aeab8e508d7968b4956934b2ade85435f
font_02_sfnt_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 10920 bytes
SHA-256: eee06d8ccec9304b75db03acb926eee119b42330ea07a6c7b2114b46105811db