Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4420b1bb15c3d3a…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 01:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 256d5dc89e108bcc1806d43ee7594fa5 SHA-1: 8c3626f0a1738f1cf9abde2fe8ed5ada5a3007d1 SHA-256: f4420b1bb15c3d3abb93e5ad31fec404131e8478174e120dab7554ef0114c0ac
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload storage, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16106f4fbe6f46---vilumok.pdf In PDF document text
    • http://studiogiamberardino.it/userfiles/files/waludinitikex.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/1d5611260825221bf9b76c65324bbf67/daloxojifajidobul.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021429447226657.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/tokuvaxuzowema.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/54105368356.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/94810246984.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/66704527530.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/gelogamozavafubituzujame.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab20260678---basusepezeresepubugugap.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210727173838531.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/54604835889.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/jovulelakiwuwi.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/22928988585.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/785a8d1008923a2924ab1d208bd28aba/ledusugefoveduxadesel.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa01281e7b---migizotapikibuzenesutow.pdfIn PDF document text
    • https://lncl.org/ckfinder/userfiles/files/9818653103.pdfIn PDF document text
    • http://billsky.ee/files/file/19241839830.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611020c1c5c3a---vepoz.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/rolavazu.pdfIn PDF document text
    • https://thaihoanghung.com/upload/files/vifozelazorasuxizaf.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/5j1qpcji6fjj0sb5p4aqdiboea/ragumir.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/sesenaginiri.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/pegatojoronodapibesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=fluid+mechanics+notes+for+civil+engineeringPDF 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_off0000e054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86B 11068 bytes
SHA-256: 92868793ce3e7793f1d6688b3f920ff67f3dda1832f108bd9fd832f39cdcdc74
font_02_sfnt_off000111c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C8 18100 bytes
SHA-256: dbd00c0524b630db271eb3fb43979f956b1ddf86dc658a962c6c379fd709e210

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