Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a094db75012b84…

MALICIOUS

PDF

90.8 KB Created: 2021-08-05 03:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 17458f5abd4a9cb9798b175286d21bfe SHA-1: de732143daffbc37e6f370deea38e8255a2bbb57 SHA-256: 39a094db75012b84608cc240d56ab59c0968a974e9e40114aae807ad8bafec06
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and numerous external links suggest it is designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a31e7355de---5202911329.pdf In PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b571504fc---lobufufarunoxidufovib.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/gipot.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/b3d65fff7bb59afbc5cacfdb3e7c51ab/13741530470.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4fbadb7138360e5c3d18ef0556d08590/4388180716.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b48394a9146---toloxifejamobelitu.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/3b47c8dfba1e537a520461e44aa515e2/1202677450.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/daniludeg.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/lobimezemozawila.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a66f25ef3---sukinonuja.pdfIn PDF document text
    • https://bselink.com/userfiles/file/didutoberidotaxowem.pdfIn PDF document text
    • http://it-hair.com/userfiles/3481511648.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/sageposofuxixeva.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/masasalofubodanuxejegere.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89a622252---1480445141.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f372c4d55c---35673802306.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/sinewobanitodage.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/9e9b295ed3a30ce481377641b59f4b5f/10121123447.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/jugivesof.pdfIn PDF document text
    • http://klinok-saintp.ru/files/11089138833.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/3e55ea17144ca21973cc6cea6b472331/malidonadito.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/99070985548.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/6567580138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+write+spoken+word+poetry+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_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 10568 bytes
SHA-256: 10e52bfaf0e6823b397352d2b3052aeee36c392433155e8af16f2b4218214304
font_01_sfnt_off000118a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B3 17332 bytes
SHA-256: 7e65a0f53e16c139c7eaf3930ba24c0fd9d8ce643a5a5c06dd424aa80f0b304b