Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc56832ed03e83dd…

MALICIOUS

PDF

79.6 KB Created: 2021-09-02 14:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9a28aad19ee94d5646dbde12d9090e10 SHA-1: 19682910b68d6e5474b6a97ebdcce4811ebf2b0f SHA-256: dc56832ed03e83dd5ddfb64f042e4f86d6ef77069fefe50e1a3822f4ab1522fa
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure, specifically related to invoices or payments. It contains embedded JavaScript, which is likely used to download and execute a second-stage payload from one of the numerous external URLs. These URLs are hosted on compromised WordPress sites, suggesting an attempt to disguise malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810d148f722---71889197194.pdf In PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d07d61d14---gixisalasawubiw.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/5375341695.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/8353b9672e7fa88b9bfbc39930dc93b5/50000594612.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a88f2c98a3bf7e1c6c4ee47da9985122/kozibifuluxokexovoke.pdfIn PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/52885424006.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9ebbdf22c5d446a0c786526e2024a9a5/7571268052.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/8a6c252007ea483b308286f6c43e9785/86161334194.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca143a385f---dedelaxunefuf.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16088abc207ccf---98687117100.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/68218042759.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3294315c249f4bec102035eba3b58500/76954020167.pdfIn PDF document text
    • https://tepihtrava.rs//files/jafetufutibegutob.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/nomirodekamimef.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/85431011033.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/06qsl1khm583qsgvbshq8utmt8/50521289071.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xonuxokizapewan.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/mofonewoxilaka.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c623a11950---purekogoruz.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9f6215308---lodivefogujufatepu.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/25358408460.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/50058219926.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/1779233854.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/1qq1vcg1m86fk0l9sfjjkhka39/wifajutelalixijokul.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/81676596199.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5c708098ab714e615aeb4e43a77c68e7/veboxitokafijejasumet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=gujarat+road+accident+victim+compensation+scheme+form+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_off0000d138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD138 17340 bytes
SHA-256: a247dd6b9498dfd1a0d283cd76d889262e1efb7abef10e168ce28d2559bc5db7
font_01_sfnt_off0000fdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C2 11176 bytes
SHA-256: 1bf8b953376ad0f426728ddaa933ffe744fca193186423dd26c2544483fcf713

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