Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4866fc3879dd1a…

MALICIOUS

PDF

77.8 KB Created: 2021-09-24 11:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b92d70b1aa7dc081ff3d3ca188530102 SHA-1: 419c3c2c8e1bfe1d13eeb5a45e4cb3cd952287c8 SHA-256: fc4866fc3879dd1af5dcebc9f1967218ffb143d0cc49d61ad2e781d3390ff7fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution, as suggested by the 'moto traffic race hack apk download' lure in one of the URLs. The embedded JavaScript could be used to further obfuscate the malicious redirection or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://klinok-saintp.ru/files/34110390478.pdf In PDF document text
    • http://dasbluemchen.com/povaxavogitu.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/mofunepebumedipopazun.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/sojunowilobixixo.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/46396820135.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/ropepakugelama.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/gufimafosinasugexewidida.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/85551348963.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/jasojemapadudogura.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/53390160448.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/nogurokujivugopesidil.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/pobekilujigufus.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/61307931169.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/tafamona.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/xixamovosav.pdfIn PDF document text
    • http://chinalabware.net/d/files/tamivuwok.pdfIn PDF document text
    • http://chargooshads.com/images/upload/files/10455152888.pdfIn PDF document text
    • http://sabaparsian.com/ckeditor/files/files/78512190022.pdfIn PDF document text
    • https://fishboat.hr/files/fewogidub.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210915194716.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137b65ad3751---majajuvujovelepifid.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/78769080316.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f259d759ae---1232884227.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137fcd553f18---nunujatox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=moto+traffic+race+hack+apk+downloadPDF 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_off0000c7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 18976 bytes
SHA-256: 368b4655d9d61c7c56b462f975b31399c52af0f21649580af526301632d136c3
font_02_sfnt_off0001111b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111B 10720 bytes
SHA-256: 4c9597fff9602513775aac8556ee4116b6546abf8cee53ccc8766ea3657253ef

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