Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d190525d90b7ee2…

MALICIOUS

PDF

86.4 KB Created: 2021-06-30 16:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 54a8da52af7a4044296accd4bff7cb8d SHA-1: d4fa93cc0e170a4e87057ba77a1c21671926b3e6 SHA-256: 4d190525d90b7ee2d1d9f9053ccc857d8ca2a53ff52d186ba46119ffb752858c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://crysiq.ru/uplcv?utm_term=difficult+color+blind+test PDF link annotation
    • https://dalton-english.com/userfiles/file/davud.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/tukozolegojokojafefi.pdfIn PDF document text
    • https://tonitomov.com/picture/file/25545896328.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/79d92b1ce2c24e42747146497d96d11e/wefegowox.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aba4e21cbb---dasuxawuvod.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160898553f293f---42907383025.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/tepak.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/87076835204.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/25092319072.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ohllo5lgch6u1qh5jhs71p3cec/46064534398.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/65112739107.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/350324a5729fbc98a558ce6ead7d42a3/vematoja.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/01ed4fe3b937dab8a1eba4ca8283861c/fuxapadimanufufibojefevu.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/eruao8gauo0jpm50ssb2a6o575/99191651886.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/kovisatemesatibibenurut.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/58425395834.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/juvovofedu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e5822e80d---bowedosutokidipaxilobemal.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/q4o38evq745ceelpq44n0td8p7/72506262961.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb7a17df8c---kolusakesibikaz.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4136ea9ea---nixutifiruruw.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/40b73d9de1b2964ff429cc5ba6cacf8a/91495184450.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ded3mk3ut30arp8lmpq1jpok8n/86404522298.pdfIn PDF document text
    • 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_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 10548 bytes
SHA-256: c4fad05c6308a97ba9f196c2cfd3fb961dd1bb9d1b5f638fb4e4000a74e1fd18
font_01_sfnt_off00010850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12062 16920 bytes
SHA-256: 5e315ea121101e3fbf2eae87b4774796db99bbc6a35fce574aca9c79961b4aa2

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