Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b59fe14643635cd…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 02:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b4d6fe5f60436d027b868a6068953e9 SHA-1: 166fa694b7fcdd69445b8ec55ae19427ccee2a73 SHA-256: 3b59fe14643635cda6a1927c20507b9aa1ed46f8de05d0f6546c129fcf90e3d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the links and the 'link farm' heuristic point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://coretry.ru/uplcv?utm_term=what+should+your+favorite+color+be PDF link annotation
    • https://activepymes.com/pub/file/gabudufuzuwi.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16096b2c94f1b3---toturezomadisa.pdfIn PDF document text
    • http://learningkey.org/userfiles/21696137609.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/8126863620.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9917953306---zasaduzasisex.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/wugoxukogukexafemo.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///xixitafidelenikafilazilej.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d1886356af8e0900174e4a6fee6085c/desemoguz.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/vimebifudosuxona.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/bamuposirufer.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8347e52ee---33896903327.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/18481486108.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/90716349122.pdfIn PDF document text
    • http://rotang.net/userfiles/file/40609285972.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/6f11c47789b0e6054f365b8f988c92a5/ripekoviwedowa.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/nufomipegukemusik.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/pamerijow.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/fd32eaa0731219e95f26db3875f6c809/65289711761.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a0ce42b1d---vetubiremuma.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/24100032402.pdfIn PDF document text
    • http://jouezadomicile.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/96093066706.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88935b1b5---nuwazugedaj.pdfIn PDF document text
    • http://bamila.vn/luutru/files/delogawebebedurid.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/rexajawinexazavubuxufot.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609743f6c89e3---vomoru.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/sanipowasu.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_off0000dd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 10880 bytes
SHA-256: 644fda7c62eca58ccc677956694f5dbfced3fc93bb56acc43388aa67154b17a6
font_01_sfnt_off0000f68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9C 16948 bytes
SHA-256: ab2772be147426141c52cfb9097641321ce679ca8adf64d74a379308768f5336

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