Malicious PDF — malware analysis report

Static analysis result for SHA-256 369a9d87f7cd8138…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 11:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19abec194744a9157fc0f3353b6a8d19 SHA-1: f1eda70c1c362f8104a57ff4518eea1f65fa6611 SHA-256: 369a9d87f7cd8138b7590d72f3dc10cd1707973e9669321c586d1909e7c45932
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on compromised WordPress sites, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is a phishing or malware distribution tool. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://coretry.ru/uplcv?utm_term=thop+tv+download+free PDF link annotation
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/aps1iv5qc22thetm5cb966roso/luvisepat.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/39965481530.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/butewovoxadafukig.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/50272505063.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/97163062688.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/20641722764.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/sitorasalokabo.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1bfeaba336c49af3fc42d39a3adad57a/98241783636.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/82752157310.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/70576214534.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/85855100999.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/99284969055.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://tele-klass.ru/i/upload/files/jibujakenamutilagetumoron.pdfIn PDF document text
    • http://art-ball.net/files/file/7776163439.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/wazekuretoke.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///lonesitinu.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/zukamu.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/daxowiwukazovuji.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/1c91c40a7b7e96d69daebe5528992dcc/63659806783.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/80462036820.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/golizobobuxuzokumase.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/labimukifa.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_off0000d44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44E 16780 bytes
SHA-256: 2887c484706973699413b47303f2a141a68f40e88a312eb0e5a13bd068eb8568
font_01_sfnt_off0000ff6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11785 10452 bytes
SHA-256: 620e8de1a177530019fa89e3e59fcae6a40541ec5860bced5d0a7ced595d74eb