Malicious PDF — malware analysis report

Static analysis result for SHA-256 953c1be4fdf456e7…

MALICIOUS

PDF

71.9 KB Created: 2021-09-24 23:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1383cec3c7e0283683e7b24378499ce SHA-1: fe4f6a3665cc1edf9b815bedf9d7058f6fbe2132 SHA-256: 953c1be4fdf456e74961f8012a0ba2053cecf4cce0f21ea32757bbc04e9857c2
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external PDFs hosted on compromised websites, indicating an attempt to redirect the user to malicious content. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's purpose is to trick users into believing there are new payment instructions, a common tactic for financial fraud. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131a4bdeaa82---foxabipunudekezulufu.pdf In PDF document text
    • https://softnettechno.com/sribati/editor/uploadfiles/46085725880.pdfIn PDF document text
    • https://brs.jo/userfiles/files/7718122669.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/60885676980.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/raxazuzabokatutabufubifa.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d212eb5832---54751137739.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/30966177011.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/tokexapovajelasekuses.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/27835099425.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/13196944057.pdfIn PDF document text
    • http://ibb-online.ru/f/file/lixulefagoxazopizubi.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/nabasazukadodevosunazeju.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/xaxepunimabu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4733e2db5ec467c7a18015d16cc7220a/biwinesirijapiwapapen.pdfIn PDF document text
    • http://vuason.vn/upload/files/77953260327.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109031302171895.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/53403098837.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161331d45c150f---mabaxivabajarid.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161493d61cd766---45005243241.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161300c9d3404f---dosarifokil.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/81482737229.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/12b94e4cd3cf9d3a0d4b1eca4f7a480c/gerebolibadutebaxida.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8a79bcb3b3a851866e45992cbc58379/30801831311.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/pinowinasefizetap.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/vumevobute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=water+color+sort+game+onlinePDF 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_off0000b6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BB 10564 bytes
SHA-256: acc5d4483ef87530d3af5ef0fd0809b91b86aa7bd28d4e3a37e238287b6d60ea
font_01_sfnt_off0000ceda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 17040 bytes
SHA-256: 2409610008bf88dec53cccb44641eb7f8391e28083d63440de3415580746da10

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