Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7acdb9cd3cfbd5a…

MALICIOUS

PDF

93.6 KB Created: 2021-09-16 23:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48500b28359befa6e2a45e849b2d27ec SHA-1: 8e18f8b64cc015bf3356f4f1b1b54180c4ca2bd8 SHA-256: b7acdb9cd3cfbd5a7b32c60edeeff1818bc547de596cc9c3305a33e2cd65a38f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to lure users with search engine optimized links, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9c7879cc---kojigen.pdf In PDF document text
    • http://4bx.pl/public/file/11218655670.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb046c504---voxolipeva.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d29b264f77---8934706036.pdfIn PDF document text
    • http://autodilygood.cz/files/file/gubarejujizosilifalop.pdfIn PDF document text
    • https://vleek.com/uploads/files/42454073976.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/35782704876.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/fowibukovone.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/wifama.pdfIn PDF document text
    • https://ana-jsc.com/upload/files/368105772.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/kexabezed.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/gibanusitinepuwagujazini.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/paxumuviwaze.pdfIn PDF document text
    • http://tulga.ru/editor/files/55617132900.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/1422249660.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/zumar.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/lasonefanivuzozixe.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202199433291559.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/98e0mf9gchq9gj596gcfna826j/sogipanakewegizazatex.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/bexisadutonowonali.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425e73881f2---15979023183.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/bisajinifil.pdfIn PDF document text
    • http://hak-al.com/resimler/files/zewewa.pdfIn PDF document text
    • http://kd-council.com/upfile/files/vufutogepaw.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/masikavojofivikoze.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/lifed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=download+mod+mobile+legends+apk+free+diamond+unlimitedPDF 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_off000107f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 11260 bytes
SHA-256: 16b376776ad80ea1ed5ba422cd0d94673dc959f5c39b20d8f3e4e88d2199e103
font_01_sfnt_off000121f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F7 17684 bytes
SHA-256: e4e258662b362f08bff345b105cc5fe3eb887d1fc7290898e42b6dec26218260
font_02_sfnt_off00014fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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