Malicious PDF — malware analysis report

Static analysis result for SHA-256 58fdf6c74fbf8dd7…

MALICIOUS

PDF

126.9 KB Created: 2021-07-01 16:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: eb2658831d10860be4f6f01bbc1ac7dd SHA-1: f5cd08922a09f1926f2e56f748dbce8cf27f0698 SHA-256: 58fdf6c74fbf8dd7387a1232e5ea1f37d21b933620b93a10655dd9aeba03775b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/47200b65e1621d0da1a37745d0bc0200/25426292392.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad57b040f98---49295683247.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2df2594d0---8144876609.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/xewirarebowasisanud.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/filuvetokaguroluxusenifi.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160734d9aca5ed---16502471507.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7c94373f4---ladoberorututime.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52b547300---nabekepupi.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a04b7a936---31064719356.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/addee8fbc68d2490777a34aed0e5685f/86863841509.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3528b6717e643b4aeed7911ffdca2091/tutuj.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/89258154936.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b36a6244ae4---34835243387.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/sj36b6e5dlumo6qv919lm96if1/wanixazukisegep.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98b8c32df4---tefivojujupitaxizekatevop.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a59a7f2e2b7cbd539c22347930b66168/jufuritolibojaku.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/54667679896.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/e4leg0rbinhrbi4t8q77b6mmu2/tijapimoguwoj.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6433249ad---xanalire.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b0e08538d26737f16bcd3076835fd266/zapavojamupif.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/mesadel.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/982a7a66b61b7fc98af8fff5a9297755/molazuwivokapakoxujano.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/lapumidesumigate.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/sevedosezejelige.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b854a1c47c---17559356688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=all+the+fate+anime+series+in+orderPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B63 2672 bytes
SHA-256: 94cc9d200f995a44aef89865a1110c5e7a5898d83975a73e6473104110de263d
font_02_sfnt_off0001a6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6D6 10600 bytes
SHA-256: 97a6438b554cf61b5c32c6d5fa5228dff5afbbb67910a324121d45fa9ca88e25
font_03_sfnt_off0001bed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BED8 18032 bytes
SHA-256: 99dc2c26fee4ddd4b2b22ea702af74c774613e6cdc99f7f7d974057de30087ed

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