Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac994ffe0d4c4795…

MALICIOUS

PDF

70.2 KB Created: 2021-09-08 11:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d4a1954b99d7f372c2fac4d30bab3a8d SHA-1: a36c11440ac7522dd901fe9630e1680cf2b8765d SHA-256: ac994ffe0d4c4795c2b036b2f87bfa1cf3179fc82a4ac634b6d0ebc11310660b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, directing users to multiple external websites hosted on potentially compromised or disposable domains. The presence of numerous links, some pointing to WordPress upload directories, suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2f11bae789043324f2017eb7b66ebf4d/87203396784.pdf In PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/8ab7bfb071e688c31997fc3d8c79fd97/75997948014.pdfIn PDF document text
    • http://deltools.com/userfiles/file/dufabujedumunudumagaze.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/miwurorupoge.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4e7f93de2---vepomofexulamalidajo.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/9dd1cf8a8ab72bbf18d8a18d200abba6/nosunudilotasesuvezevoxa.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/lawuweludabatax.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608700c5127c2---sozusaresisamanadigob.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/makigulijopizezik.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/kojurafifuxozad.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/28175141228.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/31664268822.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9b0604c8b---93052341830.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/2u4ohrfrfr4402tr8c5g41p812/fakibudoxoralowele.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/zojipezux.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/30457513345.pdfIn PDF document text
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/ce7ec20658ed9e97c2e74eeafc449771/95919631400.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/22953801274.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/tilamoxorokiwa.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/zimadizagufi.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/fd86062328a463d62cd7441759236309/64474165891.pdfIn PDF document text
    • http://sweden2020reunion.com/clients/e/e2/e2375cbe45a1e08e95d3a39ca41e84e3/File/sevesonaniwowabefav.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8864a8332---wevovosexosezidaziva.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/mivupaz.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/4235294227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=addition+math+worksheets+printablePDF 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_off0000b4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EA 10956 bytes
SHA-256: afd918e0c59e07859d5b930abfe4b891b04d7573dfb071a6cbee432724df3141
font_01_sfnt_off0000cdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEB 15092 bytes
SHA-256: 7bd535b1eb235b5d22073424d79cc0689b56df109cbd10cf1bd6fef362f9e7c1
font_02_sfnt_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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