Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a4d9c2078386c0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 10:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c830e4f272d84df672f0d16f97cfe9fd SHA-1: 881322756b2e9d5902d4a7ad0d0b472c0dac08b3 SHA-256: 70a4d9c2078386c0c8aaa66fb53cabe440e5705de225ede384a33b321f805f72
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 or disposable hosting. The heuristic firings indicate a link farm designed to redirect users, and ClamAV detection confirms its malicious nature. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096028ed7bd5---dugewevexogoxebarusuge.pdf In PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/66498353475.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52504247679.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/553h66gn6vt0j2u65gs00gsbo1/69829101761.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/pobakobex.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/26186769684.pdfIn PDF document text
    • http://snft.ro/media/file/rutugib.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/26571144821.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c362bcd96---3551006300.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160daf9e3c7e80---62687626065.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/xoralijoxafobemej.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a48d91ab87f---xakosovefoxozu.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/58592353417.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/gubirurokukanororukopado.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/bilujetefazuda.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/voxasuwedezajogav.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160988b4002f9d---53968882986.pdfIn PDF document text
    • http://www.eventoptik.de/upload/files/bejibe.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/b1525249c35c29e5bfd508ee744495d0/29168210620.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/jewekib.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/pifanabuguvuxuwunaresoraw.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b454752f80---luwutafikonej.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/87635694479.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/31934732681.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/87685411264.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/280285c45823ac68b7542a2f71c1a581/32218845472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=mpsc+clerk+typist+exam+syllabus+in+marathi+pdfPDF 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_off0000d3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B2 17644 bytes
SHA-256: 5aff8d7106967943b0fe3e1bf67b34d880c6c475e4c5fb45f569d97e4690eb4e
font_01_sfnt_off00010148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10148 11308 bytes
SHA-256: 2fca7548ac8d5b37a29623cc2459c5f815f0dddeb8f2d23edbdc3afd994201b6
font_02_sfnt_off00011b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1