Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecaaf83681bdd8ff…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 22:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4813076383174b42481d2cf1d9eb0846 SHA-1: 9c055d971e549c3add4e68c72f843b716bbeca71 SHA-256: ecaaf83681bdd8ffa2f47892c8acb5614cc70404615e1dc97bc994da0c1cb480
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. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs, such as 'https://wastran.ru/uplcv?utm_term=comparing+fractions+with+different+denominators+worksheet+pdf', are likely part of a phishing or malware distribution scheme, masquerading as a worksheet to trick users into clicking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=comparing+fractions+with+different+denominators+worksheet+pdf PDF link annotation
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/p51d1ha0m1uuoq6072g41966g3/wexokuma.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/f8hbqrvdo4gms3qk4mt12lg255/timene.pdfIn PDF document text
    • http://potlista.com/file/files/35442445070.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/679ddc275bd4373f93b1343c87072195/dedimakudidazetomidu.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/muxapawifadiwurumixozeza.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/bi9teaph3esc0ir9klomodvfj2/10190168237.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/278f56d366d13ecec15f1e7c80398a6f.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/nozolomanivojemotiwile.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/v438k2djs8hi3rfhapdujk34b8/85093311676.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/46767301073.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9fab58a3b711f7602f9421e05a124347/kupojomubibapigemikolum.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866d2754ff8---34510225375.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/c6cec08c74958f4c8dc5c4b93f3b778d/80935201974.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/68693284023.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d30425b5fd---xedaxabutew.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/tibop.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088469b1dcb6---40849998062.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3be4f5655a---24451313022.pdfIn PDF document text
    • http://nensi.si/upload/file/rivarunozujigas.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/razagerufatujizozon.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/68117620080.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/38603702009.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/8447158336.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/86502186175.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/84432808476.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_off0000d7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BC 18456 bytes
SHA-256: 755f417a310bac4ba06b78e01737af5fb6e201e2d22350d02e962388e87073a2
font_01_sfnt_off00010789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10789 11232 bytes
SHA-256: a513e2e36220b9faf7f31e32fd153d0b9b865474f0b1e72f1ab78ff4daa3d45b
font_02_sfnt_off0001218f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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