Malicious PDF — malware analysis report

Static analysis result for SHA-256 e471829c21fcb5ef…

MALICIOUS

PDF

162.5 KB Created: 2021-08-16 22:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 827e3bc01154c340247c30e3e8b3b081 SHA-1: 83170720427d37cb02f452d55d697cfca9c3b433 SHA-256: e471829c21fcb5ef62d256735d19b2c8aef00dda3c39a9cdc36a87c36cb1aac7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. It functions as a link farm, distributing numerous URLs, with several pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of multiple external links and the ML detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://faceless.me/userfiles/files/vekodezolijuzekerozunu.pdf In PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ff07704a009fe4187bcbf5bcc59fc425/wurodoxedofekariwil.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/72452785085.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/50529794347.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/fovixajofojafuporimenufuw.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/37598108608.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/tuzuluzupinezitofur.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/73947044971.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/2e6e3fde5f8a895a832f2544342aaea8/29041759593.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6c073ed67ae81c1224ce88a040bcc9fb/38129666997.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/22537827409.pdfIn PDF document text
    • http://hkalc.com/userfiles/liregarudevazowa.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/gq0ou0t2ppp8benbsg261m21m2/80270837142.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tikugibaresejemavefesape.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/4dc7a8fc841f3017c4cef8007f2a04c8/dadajiwozegafapadezugoja.pdfIn PDF document text
    • http://ipublicity.cz/data/file/nomidasojixuvagu.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/60269789414.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c0760a90---papadaxeropolurunijosikux.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/nixuroxuvafolefuwe.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/59771522192.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/9c60b99f08fd73a095adcf56a44ed590/fukubafumusanix.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072df6a4b4e3---23215685934.pdfIn PDF document text
    • http://its-bulgaria.bg/files/file/repudusamomapelawodifuva.pdfIn PDF document text
    • https://laps.pl/userfiles/file/33512745533.pdfIn PDF document text
    • http://apple888.vn/luutru/files/43223402144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=free+printable+pictures+of+body+parts+for+preschoolers+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_off00021920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21920 11048 bytes
SHA-256: e3ae0a04e8c525f1eacb24039c836999ab5678854fffafbb81a0a69f7bf2bc40
font_01_sfnt_off0002328f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2328F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00024aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24AA1 18404 bytes
SHA-256: 5cd0020197cf0cf0679f959680f4585f34d9e0cb639cfb9beda7c2e904a0a72b

Open this report in the interactive analyzer, or submit your own file for analysis.