Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfe6c83d06529a7…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 08:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 873435b482dd83b38f5df21a182ea410 SHA-1: aa317f3261996d84cdaabcc95e9a88e9f1749e8f SHA-256: bdfe6c83d06529a7c1ad11b31d1821baff527c181fccd6de6cdd03e583371e3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ca15e99ce---21614770799.pdf In PDF document text
    • http://innovad-ltd.com/userfiles/file/weratelo.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/68173453190.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/fagewilixupinebopatafuni.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/8oth1dsb5s5k5vfuv6ks4ucbg6/juwipudomekirorebewexovo.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149be26ef049---29776029851.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/26825162252.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/veovmjoda8grtfqtflhr734p43/xofapapixofemoretire.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/55867798149.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/mojemuxulepudote.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161461a1eeafb8---22007118446.pdfIn PDF document text
    • http://annabarons.com/files/files/gamanipupu.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/35998450322.pdfIn PDF document text
    • http://ranczowdolinie.com/files/2079824055.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/3ftqco3sl5g5a6n0qbn4btj4hf/sulesunowilusamokalov.pdfIn PDF document text
    • https://aaaxxion.info/images/file/84717093254.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42869348011.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/zesorexukijoxupidupameji.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/8707724608.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/nezipefawozidifubiza.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/nefotisixejiju.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/acb3332411dc7e77806e9732a42aeede/gesavem.pdfIn PDF document text
    • http://gibisch.biz/files/files/fuvurituxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+monitor+cpu+usagePDF 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_off0000b0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C3 16916 bytes
SHA-256: 5d3622081d2b4fbf56b94d18c2834f78963b782c4eea1aae4c842ed1f3a85d70
font_01_sfnt_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 10892 bytes
SHA-256: 39b7c18250ee87d8fe1d825a2d3e436cd21718a1fb058bfa89e18bb403dc7b0d
font_02_sfnt_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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