Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fd21742fdd267f…

MALICIOUS

PDF

86.9 KB Created: 2021-08-08 19:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 597c9ca8b15eaf7adde302ad2b50590f SHA-1: 4519d8e0f757381dad20bdb4878849eedec13d01 SHA-256: 54fd21742fdd267f95d4dd5cb55e221488296eae6bfa18d504e4f943572baaff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress uploads, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c77707d9d42---merobemezolopog.pdf In PDF document text
    • http://intelekt.biz/uploads/pages/files/suwimufe.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/98182264313.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/lusigewazemipirepik.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc9dc4738b---27019315324.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/9414943365.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c5c1bfd5b---wamemesumegitiwunuvemo.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bc75530594f---44683179967.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/d6e89492cb61cbefeeffb9cf17d86094/momegovokaratave.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/10961225891.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/e1676edcf340dd03799d6299cff29250/34379488924.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9c75901eb51262023816d389b547c39/tedexepusibabifedi.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a901364d3---xakipekaw.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/karakoluwedamuzux.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/8886078121.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac2234e15---jaxobipijitize.pdfIn PDF document text
    • http://limoride.net/gallery/file/43191428227.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/gedamigipegamodasanin.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/bumawopepum.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941d611ae76---fojazati.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/99190016541.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a5998c7b06b971a1fc311f53f835cf20/baxixawibogawilozanukelis.pdfIn PDF document text
    • https://norservis.cz/files/files/vapadasegezeg.pdfIn PDF document text
    • http://herve-coiffure.ci/files/gitumamomuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=rosario+del+espiritu+santo+catolico+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_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 18056 bytes
SHA-256: 875b02d3af82a072dc2f740517acd6cdc905193c07272ac89ac8a072fab56d05
font_02_sfnt_off0001336e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336E 10756 bytes
SHA-256: 526464b66e54df8610cff5cd84b132ce3c54bbc554498c082415039ff3c6778c