Malicious PDF — malware analysis report

Static analysis result for SHA-256 e70f46fdccb22b8a…

MALICIOUS

PDF

93.7 KB Created: 2021-09-04 00:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b7ad69f810d6aeee9dbd82a4c1807252 SHA-1: 65d1a94c07fbe9fb00e1e8a8fbfe1a7c37d3a5af SHA-256: e70f46fdccb22b8a07f5329bb5037d7b3470be8858fb74b9e980965d5ad8c956
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/suxigiwalonilaruduna.pdf In PDF document text
    • http://www.hcc-cpas.com/siteuploads/editorimg/file/60057549065.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/t4qg9s8125hr4v58iate4lv557/71348352240.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73dd7c662---62505435567.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94d091248---28004303230.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd3e825828---jixivejezas.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ff9c3405c02757416e86e36711e7809/97664236172.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/14899666792.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609891a5aed6c---82151068000.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/29488710982.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/9048490239.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/xuzexef.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/55234820480.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f23dac3c0---51798345758.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dc4c96007---dukologakipegexade.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/pibotasoj.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c6520ec4ce2---mijeligugisubosutabinoz.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/54691730126.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/12801107741.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075357b352dd---budilerufikemexato.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/jonulun.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/zirugetabudikolafifemu.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/70953139665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=scout+knots+and+their+uses+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_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 10940 bytes
SHA-256: f7d3e53460d0254df8280330359dacb8d0e282c67b5d475cdef1f76a3020a7cf
font_01_sfnt_off00012065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12065 18796 bytes
SHA-256: 9f774a5907cd2a6aece57a2e2da119d0bd54d2d71b8fbe5477791d1c53f1944e
font_02_sfnt_off000150d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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