Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7f0b3523936fc5…

MALICIOUS

PDF

78.6 KB Created: 2021-09-21 00:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 493c33d44a1f9813fcceec362d0e5a5e SHA-1: f0228f68078a0a773c56ca9cbb5f0dfffc0f21a9 SHA-256: 6f7f0b3523936fc5f2f649c915a4c854792a2e239a26ef69c9b2d7c389e43eaa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a malicious intent to host malicious content or phish users. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://istanajp2.com/contents/files/wejidofujuvajajere.pdf In PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/sefimiwos.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/57330329557.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/bulapurexonig.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/50216492295.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/pimixosujiseresene.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/gudixunezanelurebonobomej.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3654_20210904132533.pdfIn PDF document text
    • http://charivne.info/images/file/foduwapumerifeposoxofuveg.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/tupovofixurufonobev.pdfIn PDF document text
    • https://akconta.com/uploads/files/51624241511.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/4589484153.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/biwumi.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/51921305710.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397dfb45617---49003580536.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210914190133.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/papadofosejidi.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22932667296.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/81e00f0310c5c5e024b9a5eb7c2a88eb/morekilererovo.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/zixojorisulalim.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/4282d5cd7d802d5c7627bb8f1be7045f/nutoxa.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/vogesevigitefufif.pdfIn PDF document text
    • http://matras-devison.com/upload/file/18302044346.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/89890496386.pdfIn PDF document text
    • https://alev.az/userfiles/file/24662830022.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/moxigawetodiben.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=wavelength+chart+of+electromagnetic+wavesPDF 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_off0000cc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC58 10928 bytes
SHA-256: fc4edb2e33e51ae6c114da619430729510f0073ac4ca87b0d3227dd01880d9f1
font_01_sfnt_off0000e587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 17780 bytes
SHA-256: 30b5379c9f7914b6a0bdfb6ddbe876f82da429abdae049f34d7cf9456aa41359

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