Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4dfd12a84172f1…

MALICIOUS

PDF

93.2 KB Created: 2021-09-18 22:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b7d9fdd1071afc6c806bc8a4df0055d7 SHA-1: 1d02fefbfe29b93a0443be8bc04b5ed2190000cc SHA-256: bf4dfd12a84172f16821894ef6798978b020503363b1ccf25a8e594c30f7f117
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is a common technique for executing malicious code or initiating further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fecbce3c92---birelazo.pdf In PDF document text
    • http://sdes.in/uploads/19117386223.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/40736393765.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb5b43e279---bumikupurexumojuxim.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/tusovalexekudisokefex.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139675633819---sizuwifiwofozewa.pdfIn PDF document text
    • http://liily.jp/upload/file/20210906200529.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/4234916704.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/43b042b4c22b6317a45aa9828e867909/vamisa.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/0fc9d1fad85108976688a97605967a00/juwexagivejuzesimebigomed.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/fovigomegimibizesarugedit.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/kakosajebubofozugib.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/17266903295.pdfIn PDF document text
    • http://citty.org/images/uploads/file/tebupirikujive.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109082210286939.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/rixuzed.pdfIn PDF document text
    • http://iltorg.ru/upload/file/wavofik.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/zavosofibipofuv.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16132c8b12dba7---rojas.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/98tktcujonoh6hpd0aqqigbguv/xoxuwiriseletekikegete.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/84498192885.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/welisinufo.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210902124705.pdfIn PDF document text
    • http://sayarbobinaj.com/file/welofujinilifezavebaz.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1614610a781ba7---98560279183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+fool+pokemon+go+walkingPDF 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_off000105a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 18760 bytes
SHA-256: ed277d7b8a0152867ef5a1347ed3b716afa1b13d051c08882aa9522ba598b0db
font_01_sfnt_off00013681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13681 10604 bytes
SHA-256: 213f8b7dc6978f64a8d5f0672fb2ed5ac3ed894bff8823b3778b825d70c619c8
font_02_sfnt_off00014ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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