Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d662d623d230f0…

MALICIOUS

PDF

73.3 KB Created: 2021-06-27 18:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37f238a817e0ee0917a69a54745edb20 SHA-1: bfc20e012b78a09838ec9dc806ef8c3d85d056d5 SHA-256: 98d662d623d230f07d6d0ea23ad64eff2f79b135e9707d8dc78ac3f0362e219d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of external URIs and a high number of distinct hosts indicates a broad distribution strategy, likely for SEO poisoning or to host malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=prayer+to+take+authority+healing+protection+and+deliverance
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e463abe692---87878452939.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fc45cffc7---47299244888.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/5b75v7rtt3ca9ligq8ebodtjuk/lexarabumawenuviregeza.pdf
    • https://menlopark.com/wysiwygfiles/file/6225748970.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/9cb6b021ea2f1aaa469adfd31a38943d/xokomufoluwidewegegitik.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/20hbe47usdfrlaal85l77qpro6/vexedidonuvapaxo.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/b3d9nr4djrhlf4d5jquilrf317/36974834765.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3e8221cb7---jibizufosedexigifug.pdf
    • http://myjobcareer.net/userfiles/file/2021062500532773499.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774251ac7ab---turedowegifexazax.pdf
    • https://presstone.hu/userfiles/file/53262662515.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160730e4208f3a---76098788140.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607edb5698b06---muvefirufinaz.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/pad49qtughdsimuqfkjo8vpvm2/13297837807.pdf
    • https://living-stone.lu/userfiles/files/fawabadujadogoxumanati.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/0uu2c6sf1getnkgveq7d6499li/80169333463.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160859d4796b4c---18194060703.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7339561cda---ravokolofofumanigixose.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d6aa144b980---gazamasiwonilaf.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160805c3d785af---tipuxotidefowafepifotoz.pdf
    • https://turkihale.com/userfiles/file/figujowup.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb4a1f2eeb---pubaje.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d75aa5caf---pidamegixakim.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd7f.bin
1d9cc6c9f92486c57a83c4b46c64c1c4cea9f5a5f505fe6be43762b4028614d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7F 11000 bytes
font_01_sfnt_off0000d6c9.bin
3232f2eadb0e011f02d5a6b4bf95442dc9983829b5e6643aeb3bcb3651a65ecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 15904 bytes
font_02_sfnt_off0000ffa3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 16792 bytes

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