Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad4d936ee93dc12…

MALICIOUS

PDF

91.0 KB Created: 2021-09-01 23:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 97b7678e826b488bcc7e408f90c6eba6 SHA-1: 5814de8477f0809c8c9b2fe34cadcc23ca5aac40 SHA-256: 2ad4d936ee93dc12e92b7c845d11efdb35533d851539f476801f1167a30fa263
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and a significant number of external URIs, many of which point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/3f7383ae84c93632acf89ec5180622f0/naparo.pdf In PDF document text
    • http://labradory.pl/file/73920191473.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210716222811.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/10213374785.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/716633392672c76183d9427726788306/83325454594.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076d3797048a---jofodepuzisuri.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/besowulizote.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/kr561g234volif91qtqdla9aog/zuporitivonokuwavizar.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/vinisapudixuzoj.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a6bf341b9---4594006764.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/navurowasabaporuxojomose.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c32075c77---58399864916.pdfIn PDF document text
    • http://sadrainsurance.com/UploadedFiles/New/file/nudepitupaminawera.pdfIn PDF document text
    • https://service-panev.com/userfiles/delitoku.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/17142766491.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/61974909398.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/kizagiximemirotaduwug.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/0r7oajb4gi769d6pjl5i91b413/95610593819.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/vegerobexiwazijagezulekux.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/81668823565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=statement+of+hypothesis+in+research+examplePDF 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_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 18212 bytes
SHA-256: 8c91bd51cc2e950c2c9ca4c9ca62a1ebd6ea6e4ab4be89446a7e7e05d27f1a4e
font_01_sfnt_off00012aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA8 11036 bytes
SHA-256: d907f2ccaa149d5ad676a05d8dbe385c1889388b3dfd4c5b6ee06fa508d4dc86
font_02_sfnt_off0001442a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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