Malicious PDF — malware analysis report

Static analysis result for SHA-256 0948a58ec1f2ce3c…

MALICIOUS

PDF

78.8 KB Created: 2021-09-14 13:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e43625e1916d9159b1a466764ca936b7 SHA-1: 668774317ba5d48031ced363fca1e82b0dd9f810 SHA-256: 0948a58ec1f2ce3c523a2a457e7936e958a8d7cd1467a40a77cd8897a249dfe1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample was detected as malicious by ClamAV and an ML classifier, and it contains heuristics indicating a browser extension installation lure. The document body is heavily obfuscated, but the presence of numerous links to potentially compromised websites and the 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggest a social engineering attack aimed at tricking the user into downloading and installing malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://briztravel.com/upload/files/58369367282.pdf In PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/towajukipe.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/86967452806.pdfIn PDF document text
    • http://sswjeans.com/files/bapukurolalof.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/limegix.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/60413637481.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae369a2402---66162524565.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/nafagitufeleki.pdfIn PDF document text
    • http://mweb.cz/images/file/74365604046.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/90906141851.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/44766638797.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/sobuxiwolet.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/6437516380.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/35550081120.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/vexakodijevosilinozote.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/28464204810.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed52e73d82---xifapezoxibopinoj.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613794116011e.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/sodawotutader.pdfIn PDF document text
    • https://tigapilar.com/upload/files/13661290628.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/78144641124.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/60450252598.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/nusuvigokexeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=show+password+chrome+androidPDF 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_off0000d0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 17436 bytes
SHA-256: 2ae8477e5eba8c42919f4f5ccf69fa46fd5c36e38a30831c7ef2248409b27b96
font_02_sfnt_off00011537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 10796 bytes
SHA-256: 5afc4d1145d3c38f64c522fe3a31a6af3e56bbfebc83a5dbb5b0e46d707e070e

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