Malicious PDF — malware analysis report

Static analysis result for SHA-256 929f58b55e98e9be…

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 15:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b36cb591e8c69b43ac1f16bc76487d0c SHA-1: 66bb72f1ed2a2ec3b8ef4ae1ded17e3e7e2fb252 SHA-256: 929f58b55e98e9be1b2839d3b5113d1a4c2bf8534ccf0e8df01274f13b20b0b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The primary function appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://martonaroniskola.net/userfiles/file/mikur.pdf In PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/duzulafekelebow.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd1bb79a3b8---49456209260.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/76040200082.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/nelugimigutor.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eabc9d879---nenuzedinugafema.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/2220764487.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/612b238cacf2e4eae5df7351f65e62e5/tedovusofezuf.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ac925715---mufuridenexo.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/59136628725.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/64816790625.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/50298914954.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/83695445450.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/divolar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b30df54d8d---64680183257.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/zidejipimemexu.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/dodajesovabamasuzep.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/baleweri.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/j1rde7imjt4uukdvrlq37mcvc7/86062927227.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc65491c79---86075908821.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/f365786084eea5b0ee56c0b770c66e26/gemidagosilidoje.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/rinerugolebozukejozob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=3+paragraph+graphic+organizer+pdfPDF 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_off0000d315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD315 10724 bytes
SHA-256: 138a3fe334cd6702f7e276c9a1e27f55dc4a85def6730f3170c59886613d0070
font_01_sfnt_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001037a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037A 16680 bytes
SHA-256: acd5ae20c2b833249939bc80dc417b06025fdf001e3f62436d158a3d72816a2b

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