Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce4ae1b356d5eaf…

MALICIOUS

PDF

70.7 KB Created: 2021-09-09 05:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b415b90681c46f7a8de795f9d98a607f SHA-1: 9a46cce05b5acfceeed3581f5b72364c79dcd5e0 SHA-256: 4ce4ae1b356d5eaffc6cb1a3bc9f1abc716215fa4e3c0c0fd35e5a35b7f5bb5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and a link farm pointing to various domains, many of which are likely disposable hosting. The presence of embedded JavaScript and a high ML classifier score, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a malicious intent to redirect users. The primary goal appears to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://eclearusa.com/images/file/korimilas.pdf In PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/kawenigedaripiruf.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/90130152721.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/83600089044.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/89251979638.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/74983409552.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356f967ba02---10994811735.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/68e22a5624900770ab62ffc8980054e6/tetebunodubutijuvod.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/modoxodexarani.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/kowiniromapesosado.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16138bfcdf1be1---wuxuxedimagej.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/fusirevesoxotaxoromew.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a40650e03d7282934513e3b2e530dd56/pojeganaji.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/11582472749.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/gubijabififozewobikumifa.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/zukibiso.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/71256409789.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/muxejefaxanagule.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/80900505175.pdfIn PDF document text
    • http://levotst.com/uploads/files/93687303446.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376fd84a4e1---retatewatebov.pdfIn PDF document text
    • http://aven.su/userfiles/file/69344583817.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/48055612605.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/juridifatagupafenobada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gamepad+android+no+rootPDF 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_off0000b6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF3 15408 bytes
SHA-256: d1473d52cf0cc96fa1528e588370b88214d0f09991afdbac8aaeb134328bf504
font_02_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 10376 bytes
SHA-256: 5f6adf17da6babc0c26edd4490b7f26b2d92f755bc2087a069e01f8d836f9b11

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