Malicious PDF — malware analysis report

Static analysis result for SHA-256 e091464b69d5352c…

MALICIOUS

PDF

76.6 KB Created: 2021-09-09 14:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2457c884a8ea089067b99f3aa3af53d SHA-1: 0207d570b5b57d55aaf6e19ebd75f58dfc1dafed SHA-256: e091464b69d5352ca6e2fd71fb5e425fbcb1b396898effc43f3309d5f0398035
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, 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 for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://termosystem.pl/userfiles/file/93234819595.pdf In PDF document text
    • http://vdi.vn/userfiles/file/6759686216.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/65155448840.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/40801303664.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/68541433268.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/jamamogon.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-04-07-08-49-ASw1sUTr.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/89306089632.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/vuvalanodaruzakopamixujev.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210908140117.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/6635503762.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8f36f51ce6e811662782eedbdffcb71b/95446423684.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613674c8246a9---musovukamefulotok.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/37040405755.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/88670dbee380cd5a30ab0cb1997e5abe/fopekajuzigovumuf.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/demeromasabi.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/buzesonujefikegudapufol.pdfIn PDF document text
    • http://cabini.it/userfiles/files/14763463035.pdfIn PDF document text
    • http://qwerty.pl/_data/file/zinine.pdfIn PDF document text
    • http://midel.me/userfiles/file/12645669753.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/kudenefetuwevokena.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/9829276749.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a0b092b34e87be8378d94e46ef85cc5c/malivole.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/41829889020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=danny+the+champion+of+the+world+free+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_off0000be3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD650 20368 bytes
SHA-256: cf715fe8eb369cf0f68bb2f45121faa4385222346f93968e0491673263c56a42
font_02_sfnt_off00010b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 10916 bytes
SHA-256: c60b2ba21a84a6f02959737553256814cf626458ee98b334815e30648934aa41