Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cb485510963b61…

MALICIOUS

PDF

92.3 KB Created: 2021-07-08 08:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21a7bf6c6e6443e64fb9485f92b864bd SHA-1: b5c086b85f6ec5cdb430c5f1b24451f4b4d8fc66 SHA-256: f8cb485510963b61a2ed61b6e6c11fb748c656123a2cdf59f13873ca082c1617
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute phishing content or download further malware. The presence of external URIs and link farms indicates a primary goal of redirecting users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=god+of+war+ps4+iso PDF link annotation
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/15554189339.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/eers9mj3k2nc866g100gmq2g75/lesavoni.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/0be802d0dcb45a82be2f0af86fc6a48b/65383543489.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/38444132918.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1d151337c---34005915684.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/ridodaxajukob.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c40759737ef20bfd8aef12f594fb86dc/jipuwuxupodurewukatowegoj.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/vuzinexoruf.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c336321b73e---rakijosuxigifolaji.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607516219ccfb---dapurepikitunun.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/81687604862.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/xatusavemovefon.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086837dbb933---15627228998.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-22/20210622181402223708.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160acf34807e11---rezeridesogatididujexog.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/mofekug.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/c56889631345cff0351a7f41bc6d33e2/38148324729.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/givizu.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/70487162226.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c76b60147---virudovalugixopolir.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a53a9be6165---29510464646.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/okkbv7l48d95bsl3guutiolm5c/46046582955.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/c5cac3b191ce8afeddf70124f603a923/gurekavobunawisenipo.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/71732495907.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_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 25348 bytes
SHA-256: 5f891c048c3da2c731172fb65bb6d6206f5341872491d047a632a77f76cb48d7
font_01_sfnt_off000132c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADD 10312 bytes
SHA-256: 4eef9e43391a557bc96bc827d40ce52ec35601226468a283d0506d28a24ae656

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