Malicious PDF — malware analysis report

Static analysis result for SHA-256 96bfcfd971c478d6…

MALICIOUS

PDF

90.2 KB Created: 2021-08-01 09:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0522fff8fd72ca7b2175c12a0517febf SHA-1: 85e5e375a190e4b5e7a1bcc8f9bcceb8e29f347c SHA-256: 96bfcfd971c478d682db698fd9bf68a1027530bc4851cb05bfb35528772c6523
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=jacques+le+goff+documento+monumento+pdf PDF link annotation
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/h0haj4hk0k274hambaq9n28imb/sovefaforonirepil.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/dorepelidiziluza.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e9ac36b12---tigugufomexa.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/56610696813.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f6de1dcd7---35054561338.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/49806635284.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16073e0e293f04---vosoxe.pdfIn PDF document text
    • https://kawanmto.net/contents//files/sanufemope.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/22523139579.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/54503118175.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/3ee691a110b91fc0eb9c8941acf2b29d/purarasefek.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/c496ca1247dfc07de6494b6350095a3f/96374068205.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3c6686f0aeca0c83d9b39e2a62ee2f6a/35533348906.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/vujimujekonogusezup.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/e38cfe064882ce389bcc76cec980b2f0/97204832640.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210626181115.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/61009206359.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/13629460583.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/80450054867.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/sepowerawufasejawumu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5293ed49a---44154554767.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/kurenajunusixapozavodo.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/tapewadumejetelekipoda.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_off0000fa06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001121d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121D 11008 bytes
SHA-256: b72320e7a19db660a11b328edbfba3ac4958759c645f4c8c15221f9d82e29f42
font_02_sfnt_off00012b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3F 18688 bytes
SHA-256: b03b0661254612ce15e06c5dc11b3a9502bfad0a357958de79fd509e3e81f597

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