Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1760715fa6de270…

MALICIOUS

PDF

138.0 KB Created: 2021-09-24 07:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3908c330f69e47903b3ab4f4116ca22a SHA-1: 14de092b4849d79e48102f5312206419131dec92 SHA-256: c1760715fa6de270bb5cc58ad2a67c7d3ae5d1e2cdc30399e23558798217ce9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to lure victims. While no scripts were directly extracted, the nature of the URLs and the detection indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://sakura-bashi.com/uploads/files/202109100950297609.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161457a2a523b0---sujaxu.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81164886089.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///99717488415.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd85956554---66372486363.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/redawololuvepofejimoteni.pdfIn PDF document text
    • https://amityhr.com/userfiles/file/10453104226.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/11675878947.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/kigeluzazodavewugivov.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/zudunosejagotiroworaruz.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/22369047081.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109021222309764.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109122013559611.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/zakepox.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/b44fe93c1db63e73356f5743ff8d292d/silodonenos.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/7ba216b438aeeaaf2474719b82fdc334/gizumumigekawanidoxelejuv.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/visaramejaxilipafuketu.pdfIn PDF document text
    • http://rinsacars.com/files/others/zavemegumajape.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/41840687519.pdfIn PDF document text
    • http://apsons.eu/files/file/telutinelexami.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/xuxaruzubobozegobewened.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/fivifetuberex.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/64233322056.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1631383924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=nba2k2+locker+codesPDF 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_off0001b7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001cfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFE2 19688 bytes
SHA-256: 78a4f29e8658ba4384fc1f3b729be36ea8e64933ee25af421b4f3757434e9ef6
font_02_sfnt_off00020231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20231 10400 bytes
SHA-256: 875bddc83505ea26349e269ec99a580cb5263a51936372cc9f99e372fcd25a6e

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