Malicious PDF — malware analysis report

Static analysis result for SHA-256 546331ba37f47b4a…

MALICIOUS

PDF

83.8 KB Created: 2021-09-09 03:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 39a523cb556867575681ab8cc1be4ab9 SHA-1: 37116274680e0e2e074d4e5a446fbb7da0b55e65 SHA-256: 546331ba37f47b4a20108f5cb0090feef72953bf2a38c05124b449f1704d79ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/fewagajezevevidikokuzake.pdf In PDF document text
    • http://rosabaum.de/web/editor/files/newetigifufi.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/fulul.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lobuxose.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210909071716974.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/fifiniviwe.pdfIn PDF document text
    • http://gptools.net/userfiles/file/midifojakim.pdfIn PDF document text
    • http://halanmilk.com/upload/files/17487706804.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/fikofimaruxaxinokiga.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/28173180355.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/rogokisinefisaf.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/dalavujul.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/68676507165.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/wowipoxe.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/jaxute.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/fibefogofusabuwugoluvote.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/54147309916.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210902/file/16305514883970.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/02efed0700855d96d33ccf9702b098cf/18562389369.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135924338cb0---72955770380.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613944bf72e0e---xolulovunijiledewuju.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/powimava.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/fufipumuxovaba.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/varonajuregasijuzizes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=118+elements+and+their+symbols+and+atomic+number+pdfPDF 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_off0000de4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4C 18504 bytes
SHA-256: b7b526fe87ee36f554e8593dab4a406e2b3ac0558a7240d88a483bb89d2af2e2
font_01_sfnt_off00010e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12675 11404 bytes
SHA-256: 523d8f4a59379d053de577bd1e80b700e65962b79cc4e33ed6c315741ed5de83

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