Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bd8e635d4e5384…

MALICIOUS

PDF

91.5 KB Created: 2021-06-25 20:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3068f20e88b679b216c551f0ba6f667 SHA-1: c7d05fec7584d4502ec969d356ba99fa3231ce3e SHA-256: a3bd8e635d4e5384e468a06dbf774c2b4db44e2f3a68a3fb95bffb4beae908e6
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links indicate an attempt to redirect users to malicious content, likely exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=write+a+short+biography+of+william+shakespeare
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7cab830dcb6b1a67c375166a73af50d0/rusikeletibogogeb.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/76bv9g4qp3r6pt6quje75d3qm4/84430729811.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/22fa89ebe73ffcf451ae92425266ecb3/71565883973.pdf
    • https://lapalettedesarts.fr/gestion/file/dasujawoguvodevuxokipet.pdf
    • http://aplus.to/userfiles/file/70167728552.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/f77e51d1943c17df22ebba900e266a39/bofabazexunusomute.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c5500ddf6deb1cf7067aeb3d0fc682d0/16522719717.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/eba6fca5847d8798bac6c2b124a0f1a7/41640408270.pdf
    • http://willbramephotography.com/40193993869.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/4b9de5657aa0895e83753f73e9d436fa/bujifikejugizodegobowadi.pdf
    • http://nw-line.ru/generic/uploaded/pakapixewofo.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b35ee2d4e6e---demubiwag.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb3ece09a5---vutig.pdf
    • http://remaining-mc.de/userfiles/file/widapunawonepukeves.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160948c16e222f---54672226811.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/79679643638.pdf
    • https://radmangroup-ye.com/rgfiles/file/fonijajafelajaxi.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b41b1c887f8---22449656032.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607287d257970---92994352789.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089b60cc3990---valakipel.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5e1e215c0e9d482733f26d7849869b43/vutirelaj.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d95eccaf45---29921855716.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160923179ad79f---faralelinaxokupozufotide.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606efaf9bfacf---sejonakifabesixibi.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160714591988c7---47218182481.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_off000102e7.bin
fa3c94ef6bce2c05fc315a611c7137297d10c25c32dd2cc83200d6467bac5093		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 16780 bytes
font_01_sfnt_off00012e75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E75 16792 bytes
font_02_sfnt_off0001468c.bin
8efcaf8a3333dfb93610f98e5e855a53f91e037d38874aa127dc959a33351c81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1468C 11128 bytes

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