Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8af375037b1ffb…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 17:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 38620efa25b27e0e075cc43e11410c77 SHA-1: 534f33579f87ed22582b9a3213780a7ba750fd83 SHA-256: 3c8af375037b1ffbdbfc60c666bc7c5135ba34adfb98d33c2e4c557d8071a6d2
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and a link farm pointing to multiple potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content or further downloads. The presence of urgency lures in the document body further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bumsnab.ru/uploads/files/vexareli.pdf In PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613106fbd8b09---86893528426.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/7637339932.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9328795e1965880048cac8ac1c4468f/33845942516.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/14499707867.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/jisugez.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/tadiroxosab.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/47736972413.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/xedof.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/kajasusisivilanaxi.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4fa56223b78dad6a97758f109e1f3c65/25815101182.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/97149590571.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139216fd5c55---jedanonejeturotixavekud.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/80373581993.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/75266927139.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/firuwumide.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/21139747504.pdfIn PDF document text
    • http://chamdure.com/DATA/files/27135381205.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/43805191203.pdfIn PDF document text
    • http://stromzeleny.cz/file/benama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=top+5+status+maker+appPDF 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_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 10460 bytes
SHA-256: cf5fb2d865a8e50a3fb2d27ff7ae951b6b662829a7e5311175dfa0ef33b31b79
font_01_sfnt_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 18232 bytes
SHA-256: 62476b9f4358377f0bcab17266d086ffe8e40f70c0eeb336c545b48aa7cba0fb

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