Malicious PDF — malware analysis report

Static analysis result for SHA-256 32527e4c4b984733…

MALICIOUS

PDF

86.1 KB Created: 2021-08-18 02:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 53603fda6b82b3071333fd23e09342b7 SHA-1: ef13e3cafba7c5ba1559833957a81abb2213aab5 SHA-256: 32527e4c4b98473397607ab9c7eb1f36d29a6e4e99f80b0096818ed610deea1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://huntic.ru/uplcv?utm_term=atividades+sobre+texto+literario+e+nao+literario+com+gabarito PDF link annotation
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/zurujawo.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2cad2531---tuxirumewito.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/85222315597.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/salidalajawerosok.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/i65b1obt617h2r38094j5mg31v/wutezuwunegibikeraziti.pdfIn PDF document text
    • http://hevolta.com/upload/file/lapafewapajitaxaxijul.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/95470003439.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/42549398639.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/57441168541.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b370a8741d0---zulubizakikosoviwipix.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/fufugo.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/rinaba.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/40036932567.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/diwiwamum.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/qc25ebvhito7sab206ie62ak6h/20183163019.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acf15f634f6---14956369621.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/kerugumusifirobizojuzevi.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff8958aef---73523596512.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/8987010489.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210804214133.pdfIn PDF document text
    • https://bataretak.com/img/files/file/xeforonez.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/gefoxuvalija.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/6j5shdpebdjs1bkcdjlooc5jj2/90095859493.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/g5caht8mhrm3sdvdtb5jta3c3b/mebowinod.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_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 21008 bytes
SHA-256: c9bbf6eb66be4baec7a0a6302ab0f5f3162d0f6fa3196bbcee8123947fbc4043
font_02_sfnt_off00012e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E67 11000 bytes
SHA-256: d651549336a836f81e8c3ba2dfe804d4c41e5a7c0ce344bb6709ec2d93b36abb

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