Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df88c93daf4a428…

MALICIOUS

PDF

83.8 KB Created: 2021-07-29 10:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 236905576b61c3156d47dcd881dd3c32 SHA-1: d0ac7b51da83f86b9d24105b8f8f609aa275f3fb SHA-256: 5df88c93daf4a42834d2413808076c02db940477d3bf715950ca94af45c17d94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of a link farm on disposable hosting and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b41f572bb---kelijamakigamesajugilanun.pdf In PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160982f3877b9d---jegonajixexebipuvexe.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/83568514371.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/fijesebijofuduki.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814aee4d9ac---1869815465.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/retulezanovafex.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086ee637e4c4---fopuzezufepisoxogawu.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b50a973939---nomaxupatilixadejabed.pdfIn PDF document text
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/jivegolifusojititolorozo.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609851f738796---5534548140.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079687b3b675---donedigabigesaz.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/zoguzadiferabapizoxab.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8b6a227d2---99458577541.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/nil9pvdjre84bu10o3ia4pqqhi/jelibuwi.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/da55d5c4b791ed02393197816a6217c1/jamorukazanixarixi.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c6774bad8---zogukagepuzo.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078338c5d4d6---34710055580.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/1109841450.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/9603038534.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946ed8948e2---femupox.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/pukesowufida.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/bitarinulopowigetixe.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/18dc07e8d9fe633fbed60b23e215104d/60365328782.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/jowagedasovomozuxerenija.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/venex.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/logivawumudak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+make+a+shift+to+sprint+script+robloxPDF 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_off0000e133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE133 17352 bytes
SHA-256: f6af4e62fc15329bcd2546a11b670346dbd9ecebce5a2966bcd23cb44887c9e8
font_01_sfnt_off00010f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001272c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272C 11156 bytes
SHA-256: c9f24dad82539c77ab45fa88274a0860191e77e43e7a8ba3ad548062f02d9ed6