Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb660ae6e278c9d5…

MALICIOUS

PDF

87.9 KB Created: 2021-09-12 08:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2525c8413b7cdbe9f6fd406f0f6b2ba3 SHA-1: 28453f41719a98c0d7d0c3e475338872d741dafa SHA-256: cb660ae6e278c9d55367e3c986b51e152ee12f59b4feba9aec70c5ec6ff70d32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://messianic.live/wp-content/plugins/super-forms/uploads/php/files/baf20e0756d362dd56906862e2c4e53a/26656608670.pdf In PDF document text
    • https://sanghvicranes.com/staging/media/59401368245.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/66205101673.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/10057076981.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/tavefizuginuwi.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/kodiwulalodakozimu.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/373ea120496acd155efe0a02bfc3ff20/bibujugoxube.pdfIn PDF document text
    • https://ivanamihic.com/files/vadifitalizutajozagotuz.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/wutikafazowitasudoki.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/49536867688.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/jifuwitonovejaze.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/zebofalu.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/26416882208.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/zezelomi.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/42495586211.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/79537994411.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9e7f2b0baffbb7ec4a322c0b890dedfe/46053929852.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/xojowime.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/17793130756.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/63555791512.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/diwodixidagu.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/12243328277.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/navategesokunanikos.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/riwototijuvosolegolixuz.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138d67071130---11428468261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+hard+reset+samsung+galaxy+note+2PDF 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_off0000f001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF001 11116 bytes
SHA-256: 68afbbe2e08c96cd6bca4735dd2bf2854591ca263f1d6e27f9feccb7b3497752
font_01_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 18440 bytes
SHA-256: 7c56314dab45a196543f92f85270266083f7ac931795e090f2dc93dcc3da0cf8
font_02_sfnt_off000139a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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