Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e75ae89176ecca…

MALICIOUS

PDF

79.2 KB Created: 2021-09-15 12:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dda1a4cb30e2d443a25bb371f3774720 SHA-1: b239b92f1d62f2e2d20486881979c6c0ef04a7c5 SHA-256: c9e75ae89176eccae4c037ecc6fe45e73b565f53ca3673f5a6ac336befb20592
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript (T1059.007) further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://restavratorstvo.com/ckfinder/userfiles/files/wemevofesidox.pdf In PDF document text
    • http://beautifulmoda.com/userfiles/files/79928669603.pdfIn PDF document text
    • http://dd-eng.com/files/files/xuwasi.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/73707323655.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/97174848988.pdfIn PDF document text
    • http://villkasz.hu/editor_up/94608310350.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141184a7ad0e---nakewif.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/gedujob.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/fenikaxulexuvet.pdfIn PDF document text
    • https://chv.vn/userfiles/file/14092401795.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/vesowodatova.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/pinarinova.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/ziretebokovadagoba.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/74833832089.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/tenemagegotokusebiwo.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/60217939307.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/30072457681.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bdce01408---taniwipozifovesizugivim.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/sodebivifujezajivagava.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/7384726932.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/lipoxiwuvori.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/visasuwek.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vs4ev9f11jd2cldl0ksjp8t1g2/55463732306.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/rarelakodivozememosob.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/pinagobubifinuduvesadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=unlimited+diamonds+how+to+hack+free+fire+diamonds+99+999+apkPDF 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_off0000cfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 17164 bytes
SHA-256: 9a135a2f4eda972163907e5db62cd7510987ec89796e2416c281f572f809be89
font_02_sfnt_off0001144b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144B 11236 bytes
SHA-256: 385a3fa802994458581b97c071862689e925aef78daeb46042cd32b6e6992b8d

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