Malicious PDF — malware analysis report

Static analysis result for SHA-256 310d41abb5999320…

MALICIOUS

PDF

74.0 KB Created: 2021-08-28 10:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aac254eb77435b13b2d195f5049fa3cc SHA-1: 0f3f0d563c7f0d1bcb743b7723d3119c70c3a6ef SHA-256: 310d41abb59993201f1773be4888bd9dae8f9fd4cdd660031171de1e6b0e4453
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests it may be used to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37c347055---vozomoxesuf.pdf In PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/zifogexinin.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/rarunekuzukelumabufog.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9e237928c---51851895217.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/sukefugewepisasikufobaba.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/9cd39f17b74e0274dd317d17325feeb1/nazazurolapopiborilafan.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9185788500---67636925156.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/vutatilogugovusen.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/45819119091.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/vuxeropawa.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/72579865341.pdfIn PDF document text
    • https://manenshop.com/upload/files/wofesupugas.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/xiluzu.pdfIn PDF document text
    • https://atesolve.com/ckfinder/userfiles/files/50494405204.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/40723679269.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb35e00965a---nepesut.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161234897a1e5d---96328490891.pdfIn PDF document text
    • http://akhsmombasa.com/clients/861898/File/fipisovedupotajuzoxare.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a637ddb122---lolederadizatupowirawadug.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/5neef7potljo0c6rguvfq1u8a2/wilikasetuwonuk.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/wowujegetowosij.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6f7b646bd---56098882064.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160884e059b5cf---29604254878.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/balamevusen.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/mixurupipisabujegewopop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dream+home+giveawayPDF link annotation
    • 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_off0000c36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36B 15328 bytes
SHA-256: 927fe69031c375dbc6ba4588c67ce26aecf8e1486e446ff9bc7c392727df78fb
font_01_sfnt_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 10408 bytes
SHA-256: 0ecf23f7748ab543a5d4aa2443814c0f896bebfd46c41cf8d2d72f416d7c2750
font_02_sfnt_off00010165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1