Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b46167941baa709…

MALICIOUS

PDF

98.4 KB Created: 2021-10-13 17:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b04e36c2b7b4ab08c47ed765dd856766 SHA-1: a1a66fb0ecbc71bf4b9648f3f1738b96931d8bef SHA-256: 6b46167941baa7090a6c3553a7eda71e7885a49338659854acdf1990378dd83c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. Several heuristics indicate the presence of link farms pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute malicious files. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ec36ba25ee---84147006833.pdf In PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614502c962ded---demasiwonoga.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/25370135625.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/39102213993.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/12782834208.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/17879282201.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/gavuripojogimero.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/d9197cf98ab65a2fd7d78e818c5b5310/mugirep.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/383776449.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/vurozobipuwopupiw.pdfIn PDF document text
    • http://badgerhillfarm.uk/85621561358.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/70989150806.pdfIn PDF document text
    • https://acerocorte.centralcms.cloud/galeria/files/23246861390.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615f29f2d2d7b---refuvetalenojujoli.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0b5a59bbacdd4f2590869daa5b18b6d6/30904682814.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/82264408324.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/luxijudasosiji.pdfIn PDF document text
    • http://ipceurope.be/assets/file/76858341026.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/zijitijazipanixata.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/bipovesuripubusoji.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94627356f---80406063965.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/kufazetejopoguxufafatij.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/3966009043.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/bigijepozorelelisaneboxa.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/medovigidozejaje.pdfIn PDF document text
    • http://ux-school.ru/files/files/78090186596.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/xPAns0MRe5M/uplcv?utm_term=right+inguinal+scrotal+herniaPDF 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_off000115ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CA 10656 bytes
SHA-256: 22049cb625c5cd9e49c1dcc74e268131a277acb72628526d9e7a295a7478fb31
font_01_sfnt_off00012e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2E 20788 bytes
SHA-256: d667eb10730a6df02f9a6c3120bf827f707a661643844d24f4f5ab1c240ef5de
font_02_sfnt_off0001639c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1639C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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