Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c459b3197b20849…

MALICIOUS

PDF

85.9 KB Created: 2021-06-30 08:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02e863de344687c2bbe328094bb3a0aa SHA-1: 96348c7f87188f0bdaeb335b0429fe86c8245104 SHA-256: 1c459b3197b20849ede942802c693b25f775b72cb8f9c54b327094a9d98879d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous external URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The file's structure and URL distribution align with techniques used to distribute malware or facilitate phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/578ddc6728eb311d38a1e75a9ba29a8e/nulafimozupe.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/1227a3ba99755af34d6dd639365d8386/51395901294.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e44de6539266a84913baf046fb9a941a/gexakuto.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd39f0368---26675824779.pdf
    • http://oreade-breche.fr/userfiles/file/xekesiregavovijuxame.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/47bf69efdb784f7e9b06fcbd1e7428af/26969899835.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/872371e57685e056dfef7ec579b24466/28647353557.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e2a5feca9e1dda246fb012c2b1403ae9/vikilo.pdf
    • http://czapla-dachy.pl/public/images/fck/file/47105557505.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/26232444120.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/sh7j75gf6ashlisn5bekur4g5u/jetebezibe.pdf
    • http://nusratali.com/userfiles/files/33966839006.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/baorjcbv9j076ra3huujdjngs2/64379695613.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c614ab3c5---25077246217.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5ba122d79---kajejarixediwuraferab.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/5273585050b44b59aa5c5ae396f8893a/rufujipemazokovanolaf.pdf
    • http://work4shop.cz/userfiles/file/lesejerozanopubozari.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210505040429.pdf
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/sadopu.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/076d0fa3981aac991349346f24f89a53/nomukifazaru.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072d49978c82---64875229827.pdf
    • http://portalcom-b2b.es/img/user///file/_0980616001619772547.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf7c921f1---duratipegetufore.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608efb3d100d7---wufedebulezidusezux.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=under+the+boardwalk+rolling+stones+chords
    • 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_off0000eba7.bin
63785b64ce4aa98e590fac94c954108f319faed39f805a5cd7b5e46e81949d01
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 10972 bytes
font_01_sfnt_off000104de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 16792 bytes
font_02_sfnt_off00011cf0.bin
db3ec463c12d7cd86b5cc4fca311d0654d802f3748e0d38132e77bde4cea645f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF0 17248 bytes