Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d3a8275147d859…

MALICIOUS

PDF

87.0 KB Created: 2021-08-14 11:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 87d69bcd5594c092cfeae0a8c73c7b12 SHA-1: acd780146529b8d06eb1ba87497aa7d8ae17eba0 SHA-256: 65d3a8275147d859835abdc34774265dfa9d7f4b8862d20a7ac7f700d2dfe326
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the nature of the heuristics indicate the file is intended to redirect users to malicious sites, likely for phishing or to facilitate the download of additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=flexion+de+tronco+musculos+agonistas PDF link annotation
    • http://vieclamquantri.net/upload/files/76900410435.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a23b8744b06---34925871911.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/58985638259.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a879d1152de---59440282566.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af8eb76d60---dikusipotokumepejavivem.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7175ac2b21---53473729944.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/1098158821.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/50393455073.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/zaselanemozuj.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/xudukaf.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160848e722a057---kenokifufudutulovuzewur.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/babarabifizererefiv.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78cb845d66---35925972457.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abdb7302829---58782861940.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/pukekakopexosusaniguv.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/83037785844.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/74485320845.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e5529fd20fa238046c4530d28685da03/noziwepamararave.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/29a5fac865ee6729c73155dad1742c8b/lasaxemigazetaviwi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609074ac136b7---22969453560.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/65854230287.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/zuluwemosozifajo.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a98b1b1a4a5---37084484517.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/repenuwafonosufem.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093d006767d9---jujoba.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_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 10892 bytes
SHA-256: cc415f8d552c0f5092a32e7d99fc115a6b9c124201cb545c704e84a8f941ca94
font_02_sfnt_off00011ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 17672 bytes
SHA-256: acf8bbe60fc192496d8cc3ce14772106daf0ecf00849986412abf8cfd1cad871

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