Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a713da3940b60e…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 09:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c7d3ab53aa65ea825ca927fe65dd6e3d SHA-1: 9342cc3f6d23bfcc3568ff07a8071f8e342d8e68 SHA-256: e1a713da3940b60eb5b769c24e728db6a0673b78466fa681aac8b843af719acf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ML classifiers and ClamAV, specifically as Pdf.Phishing.Trojan. Heuristic analysis revealed it functions as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/seef7v73tmvvgcrv32e0vs0nl1/46208089607.pdf In PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/27712015170.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/vesoraxilefixaxukip.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/88781974224.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/13318818629.pdfIn PDF document text
    • https://phukienbep.net/media/files/29697754911.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/vuritabobalepikerenuza.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614948b45dbba---buselimikapafipibawuxel.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/wubejokepari.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/nijizixazo.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/4337836089.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/tuwikunobi.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614e10ad284b3---263095303.pdfIn PDF document text
    • https://kawinlari.com/contents/files/12615903947.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec165111ce---93576086634.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/29759115577.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/tapaporiva.pdfIn PDF document text
    • http://shiprapublication.com/uniformkontakt/userfiles/image/files/wejadiven.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161396bc3a895c---53906129352.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/moxifokinar.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/5851dfb0c37014ec845542d5bd15851e/44279401747.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/63429546312.pdfIn PDF document text
    • http://webursitet.org/Files/file/gijobokuwi.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/jarudigurekuj.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/72100458559.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613686c0893d7---dijovutabiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=hacked+pokemon+go+2021PDF 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_off0000b329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB329 10732 bytes
SHA-256: f2b7bc231cbacdcb82e365ddbb4ea19386ad31c9758a26bd8974bd5d4a725eec
font_01_sfnt_off0000cb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9B 16384 bytes
SHA-256: 51b79fd854f62a73fd1a367b346bbb6321550434a96c81d56fe154324f17dba5
font_02_sfnt_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1