Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f507e8318203fc9…

MALICIOUS

PDF

93.1 KB Created: 2021-07-08 11:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 9f6bc93d5e29c137d1abc89ecc6ab7ba SHA-1: 4dea502dc3bf3fdc8b6151b1e8f51f9454264fbb SHA-256: 4f507e8318203fc981fc4ed7f3a1c9e8fca65c900fe3af4aedbeb74a9afd2239
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://wastran.ru/uplcv?utm_term=who+has+matthew+gray+gubler+dated PDF link annotation
    • https://hgb.se/filer/file/rexuzolobari.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/79806312303.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/17f9455e141882fa1c884713cdc97414/45637744768.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/57336097216.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/kotanafagoferuzaru.pdfIn PDF document text
    • http://ibb-online.ru/f/file/wolugax.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/rtbouctqjlqviqsoamrjpgasi2/zuzorixalijukuwapewox.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/735bf7d522302558bf9289bd4f426918/migefufemameterud.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/eb90a1cbc5661fdc7575fb303eed26a8/19773219433.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/jawapezesemafobivogilebew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcf8d5e565---lumug.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/62663136760d09bd2d981e.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lo1pnl16j2b7qc6cs9hetm7n90/84014655978.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099867c72a66.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/36842695499.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/5fvpb1nj9h8fjg3soc6m9iq6ka/26449675578.pdfIn PDF document text
    • https://bmat.mn/uploads/ckfinder/files/11609605391.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0a68f1f3a64bb8d7a9890b49e4a4fc34/15740947533.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609abd0582f2e---faxukaf.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/6170701076.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/142766f10baa3e31b5892c8e89ad776c/kodelotuwep.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5137133c2---57015507059.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/lepitoxofudedejokid.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608d088a92a9e---81226048398.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/puzigavipakigolezurixom.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 16920 bytes
SHA-256: b3c462f70becf758b74790427ce88f98d309c5d3d9f6c04c47214bd3253e6206
font_01_sfnt_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 10932 bytes
SHA-256: 0867bc18105e4347a5df32b54faf68e6641c7ce6c0a31d3ec7ad21a909d1cbd4
font_02_sfnt_off000120ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EC 17404 bytes
SHA-256: 33dc7f0482c36aa3d28e07265f431b58af03fb9dd14c99f34125089878eb479d
font_03_sfnt_off00014e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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