Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3bb77cd74c5ee3…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 09:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3afbb728a4b0b952c68e383e06a96c2b SHA-1: c8963673cace0600e9b373749c41fdf25f3a8ac3 SHA-256: da3bb77cd74c5ee313ce76e0b1f53e24613d08e9c519ba2c60a769c2c59cdce2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress uploads and disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614102742086e---10328459795.pdf In PDF document text
    • http://iphysiology.ru/upload/kiliwogog.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/6056464759.pdfIn PDF document text
    • http://jcpingie.be/public/files/poxofalesivonotafij.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/44239969516.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/ditoteginujivaxowijuwopi.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/maxupid.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109090849193942.pdfIn PDF document text
    • http://dezis.ru/uploads/files/xufunakon.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/35372634638.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/texakarupefoxafu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379702a9ec6---18746382188.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/fusofefanod.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/68085792149.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/puromuwuza.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/53694823195.pdfIn PDF document text
    • http://etre-belle.su/images/file/27520243763.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/85222343227.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/e3i4aoebmflsdnp095nr6rmi2i/83012348225.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/fepufagiv.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/580411741.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210916224742_1562827139.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/pikakoferapajif.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/50765763633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=harry+potter+prisoner+of+azkaban+full+movie+downloadPDF 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_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 11308 bytes
SHA-256: 506136bf21642d56a2161b8f1be58ed70015f6c8143cf8178e0b7f88ed81fec2
font_01_sfnt_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 18100 bytes
SHA-256: 9546e5a3e547fd99c085043980f0dea7b1e4a6b594261675da74c5911e9d9819
font_02_sfnt_off00011fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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