Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c413ed2938c1be…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 18:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fe23ac30223cac482764c68b15a0af74 SHA-1: 8c7f3313090f811be8b0d9e96c84c0a51418e70c SHA-256: b0c413ed2938c1be511e41bef68d7a61a6f7b7b2dc0041ba4fe2f9a6b9b9a076
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute further malicious content. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.integra-cr.cz/administrace/ckfinder/userfiles/files/jolikedagofawunev.pdf In PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210911141434.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/modufefilunote.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/sanasun.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/selibagerutosupakipasijav.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2efd44b1b46a4f264005629a7b07e38f/voxoponabenapobesevusifo.pdfIn PDF document text
    • http://gojjang.com/uploads/files/mujujapizo.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/kipebabesixonema.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/28716046881.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf3fed9d6b---maragawuvadedijisolewode.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/xalowinikuzidig.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210909_E4AD1651210A96E7.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/19040718142.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/zikusifikudow.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161321eee41ab9---vexuwupuguduvujepe.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/zefegosemovajuxaruvuso.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/19440690331.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/48323840687.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/34240789729.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/wofenupemadono.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/gusene.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/28927794843.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/62830292170.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/puvepupaponir.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/12171039178.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630699969.pdfIn PDF document text
    • http://rs-entp.com/upload/file/kuxubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+mx+player+on+firestickPDF 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_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 11208 bytes
SHA-256: 18f90c98ef6fb338403fa636355759f79eca7e10a02ac5d4e6706777bb9f8f89
font_01_sfnt_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 17916 bytes
SHA-256: 6b4a8f08af763fc94de32c1748279e47009ae0d60e18907e2a2a9c522908436a
font_02_sfnt_off0001258f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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