Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f04b53a61c681b…

MALICIOUS

PDF

85.7 KB Created: 2021-09-17 18:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3af74c34c4dd7f71ca53b2b3d06622b8 SHA-1: cbb33835b68a20f02f490d7a38d04e1f3dd75492 SHA-256: 10f04b53a61c681b7c4313452baac3af5ba1a6013cdf5940c0fbb85d1406fbde
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or malware distribution attempt. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. Embedded JavaScript streams are also present, which could be used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://crysiq.ru/uplcv?utm_term=screencast+no+root+apk PDF link annotation
    • http://technoauto.jp/js/upload/files/59023540746.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/64717351521.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/ripakejosojudiweke.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/modobozebisezavizawufarup.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613446f6bb372---95841929432.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/80626610992.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/57488598181.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/bugixugozopukafi.pdfIn PDF document text
    • http://baove24h.info/upload/files/danagidowumebogetarub.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/14330004395.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/kigeviremafiguvonak.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/97731923474.pdfIn PDF document text
    • http://robedecreateur.com/img/files/20463009292.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/doxixosevita.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/tefipotosobo.pdfIn PDF document text
    • http://airmon.hu/images/files/sixevopigadivaxis.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/gogabo.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/27609000415.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/movarofezeg.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d04e447064---81142740469.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/31718691463.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/83ef5075bdd16ed45366cf6b7f4c429a/22610398655.pdfIn PDF document text
    • 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_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFB 10396 bytes
SHA-256: 8a4ae151772669dceee561ea856bddf8800394d6cbe97035c3be8a1ddb1e9940
font_02_sfnt_off0001139f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139F 20260 bytes
SHA-256: 4655ae199727a3f225ae332f0f5220ce86fbb3c47a2400641ab9aca6b64794f7

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