Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e0cb7f72809354…

MALICIOUS

PDF

119.2 KB Created: 2021-09-04 00:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a94accc79be05da84fa8004708fff4f9 SHA-1: efca1f8d358e8f2d2ab6ceebf1223dfccef52ce7 SHA-256: c9e0cb7f72809354392e83234fb934a9596d4015f55f32efddf354528bc54c42
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The presence of multiple links pointing to compromised CMS uploads and disposable hosting, combined with ML and ClamAV detections, strongly indicates a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://atpl.aero/ckfinder/userfiles/files/kukoteda.pdf In PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aaa937484704580d3b10562ae6d5eefa/47042231084.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a75e94f593---pejevekofexibixutaka.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609164ba7c9ea---48784211444.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ba3b54f31---vejozawedelemaxelov.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d45c9366c---22555835451.pdfIn PDF document text
    • https://jslt.site/js/ckfinder/userfiles/files/wixilinopejogujorebaki.pdfIn PDF document text
    • http://geose.ru/userfiles/file/zakopurusalonobopiza.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021062108001412.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/730489c7868829e4db50a46aeb60537b/xegazenopokufaroxireze.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160998fd50dbad---nixozajama.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/bopoziduxasuxe.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9ae82205c---7933018407.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16126da231458a---19997119591.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c5069b80c---fukumifexanatiwefubasaxa.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/nuxivuporede.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/k2139ge057fmesbf127h3ngit6/pudujewukox.pdfIn PDF document text
    • http://teplospectr.ru/images/files/vujawamuvalisamonak.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160feeeed85f87---63316766775.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e60d0b0abf---56847224412.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf7bc80eb2---penakiwubobotudazagefazot.pdfIn PDF document text
    • http://opersan.com/file/76857107504.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609edf606906a---ganedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=black+holes+a+very+short+introduction+pdfPDF 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_off00016947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16947 11140 bytes
SHA-256: 2ca33421f99cc69a1a5ce4d2302d563817a998fd46f4d76548159e649548ac5a
font_01_sfnt_off00018359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18359 19476 bytes
SHA-256: c4ed28b3a055632ed9773741384e31ab82d2876794e699d999e197fe5d6cb03f
font_02_sfnt_off0001b5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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