Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a12ed6925571f37…

MALICIOUS

PDF

99.7 KB Created: 2021-09-02 19:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0de63c9da482c52e2356a723414b140b SHA-1: aaa9326614bd010b959e915205adc606c11d3729 SHA-256: 8a12ed6925571f37dff073f2ab0e69444c406d4b514c7421a6628e51cf831fdd
172 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a significant number of links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious or compromised URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 8

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://agro-vostok.ru/userfiles/file/1758219436.pdf In PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd47e0e2aa---83853129195.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/fabegufibolun.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b08cca4a071---86812655174.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/dakag.pdfIn PDF document text
    • http://steinemann-ag.ru/fazufigudosumodotogewe.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072879a43cb3---85392400321.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/16798386064.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16104ec9ddec3f---48195258686.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/jexum.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/mezolavo.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160804030e286b---gapileliku.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/6a3253ff7cbfda414900d4217075ed08/makuvusamapevurid.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/57912252834.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/ruguxenufi.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/1e711af3b0b138d3c0547f5d06a1fd08/nibakopidijowasuxab.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af85d0250d2---xibegimi.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/36053648647.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-12/20210512145315962586.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/pabefilobutotorup.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8cda38e93756bcd05a0612808d0fe802/72990659289.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/gufavipomuvevonenafap.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f75a5a461---29624909242.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f787b32fe3c---nigovuj.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6e8d42035---30290096002.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4c1c54aaa---15795673853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=clinical+alcohol+withdrawal+scale+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_off00011ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BB 19176 bytes
SHA-256: 5afb7510dd6e209b3057ce6eb0c09bf1cb0b7135cfcffeaf5b35f7f472b14c92
font_02_sfnt_off00016839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16839 10836 bytes
SHA-256: a3839384560bcc2d056e282a573c64f2fde82153d649c466cfb279fa34d77a4d

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