Malicious PDF — malware analysis report

Static analysis result for SHA-256 5800f9d33b642eea…

MALICIOUS

PDF

94.0 KB Created: 2021-09-17 18:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 27105f0937a0589404e0361f0f94847f SHA-1: a6406295383f5886d8505383bffbf5e52fcc20dc SHA-256: 5800f9d33b642eea297ca2b33cc51a60ce2a2c07c8bcaaec9fe13d3fa8af786f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of multiple compromised hosts suggests a broad campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://thunderstar.cn/userfiles/file/20210914165408825964137.pdf In PDF document text
    • http://cp-1.ru/userfiles/files/31216122277.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/pujanifotuzematonefe.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/39746974209.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/74320798604.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/davudodedowawadovivutiri.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/ripemebu.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/penalipuju.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/kg61o0iknt2v16acn27k6c42ib/relilugu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311dd759bb4---wabuvubixejodi.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/74fb096d87ed9701004bdcec6fdd4102/mabudebatuseguxolufevesu.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/33178027915.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/161d64acb3234d1a1a54e2e2907afd3e/83234530885.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/82041887672.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/04d625a86b05b2bbfaf404b776b1e6b2/72154833111.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/16496407828.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/83225223656.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/99700670439.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/81236383168.pdfIn PDF document text
    • http://samtle.net/ckupload/files/muvivelipepixuxawazadedon.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/97487362317.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135913509823---79925808047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=watch+tower+heist+onlinePDF 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_off00010aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEF 18504 bytes
SHA-256: ab4df17cc4d705f800e999ee52f95131f2087a03ee6565809e9dd98b071dd5ca
font_01_sfnt_off00013add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F4 10404 bytes
SHA-256: 2d1e83f8c40830ad700fd1cdaedd2403c2e27f7cebd88288ffba85ba898ea0c0

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