Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3bd615f3dc3c42…

MALICIOUS

PDF

76.5 KB Created: 2021-09-20 21:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d6d4fc8d06a3013ae91718f9b005bac SHA-1: e1762f3d8d285deba40befd681aba058fec2ef58 SHA-256: 4e3bd615f3dc3c42420309c0b2153217cb8e34ac53dd2413c3f481efd039eca5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, 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 PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=body+system+graphic+organizer+answer+key PDF link annotation
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/k6n0qofiituf916i667442b7le/rofikololoxe.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71294167111.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16144daa700c1e---sorakilujafisexovibixuz.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210904005403.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/fesixopukowixi.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/marixesatosazanodiras.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/naforufudufoduxelumimevol.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/uproesk0qfrm2bmkhq8rqk3cr1/jomituzewa.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136259d0bc7c---jinaki.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/ramukakej.pdfIn PDF document text
    • http://gabortech.com/admin/file/75035489805.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/sotojuduxomuz.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/66747671840.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/raxagubavanixarugapakutir.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/kuxamoli.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/jawegefaduxoj.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/19258156385.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/ximunofefagupumise.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/kunoxubara.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613741351ed73---30364520521.pdfIn PDF document text
    • http://sbairs.com/datas/files/kizasizibuwubozokiwovoza.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/91480967394.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/86576001908.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/89778770788.pdfIn PDF document text
    • http://knipia.com/userfiles/file/rixujidik.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_off0000c684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 11320 bytes
SHA-256: 901b41d850375d31f2bc35e50230b131682bda5b7eac50daef6b13b8398a1021
font_02_sfnt_off0000f902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 16892 bytes
SHA-256: 98f2c53cda928598fd996025710c1dcd90108678bd3a50f6fb8de3d68b6e1f97