Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b15a4730a7ba78…

MALICIOUS

PDF

82.5 KB Created: 2021-06-27 05:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6276b8ea905f7acbb9ab096a7c327c9 SHA-1: acbdc6e321a9fac5f50d5ea51c9797c187e3d970 SHA-256: 73b15a4730a7ba7883d0e0deb041ceb4de4d25890e49ffae0af37f7ee4148692
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://smidgel.ru/uplcv?utm_term=notes+on+g+harmonica
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608406690e815---mijikibanufonefil.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a288e74af93---xebuzagaposarunuxaxosibob.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/vaeg62ih8on2b25d6rq18mv3td/27607161544.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a60de074ade---ginotuviviz.pdf
    • https://govox.co.uk/wp-content/plugins/super-forms/uploads/php/files/spm1i2e4598ij9l5uk66gkng14/16112443764.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b46a64b439---bujip.pdf
    • http://beautybybelief.com/admin/images/file/rinijikawaru.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078e409d6bbc---49644974951.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/a2ad109cefcec637b4a14c2d2491199f/jadasolusokedewojukusokik.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/388e4c60e307639647a03935f657af50/lemejem.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45f3f70379---45541329506.pdf
    • http://robalton.es/Albums/images/file///52023895845.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078750bb32f0---28754118156.pdf
    • http://sonntag-immobilien.lu/userfiles/files/furezifikatimik.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/b4e01c1b5d05e4a3b1b0cee085720f1b/wepofojivite.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/40f09fb61f00646aa2d0352217ad06c2/sokugavopeza.pdf
    • https://diphong.com/uploads/jumepiminifomaruzusodiso.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8ca25824a---62757224171.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7d663e72---gezoporanugevibasafa.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cc737e530---fojadiwotogikikogowesog.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b60514ceeeb---maxifikomomeroda.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_off0000e089.bin
01ad79a821d8a31ef74aa82e7e3f3b343e7bb6a709a39046b81fdd82822fcfa8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE089 10608 bytes
font_01_sfnt_off0000f8a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 16792 bytes
font_02_sfnt_off000110b9.bin
4aed1712afb3dd60a066def3199dea556be6041229d01813e324832c44f56ebb
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 16880 bytes