Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d36e0f4665c55e…

MALICIOUS

PDF

95.1 KB Created: 2021-07-02 05:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 022b0e98441e02db58a6d7722b09448d SHA-1: 407ca5e4c4379e20e5ebfe29f5391ced3e78eaf4 SHA-256: b1d36e0f4665c55e4ae73b99fd1df28d709afc4e4bf739f2aced69621be4ce58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a redirection mechanism, likely to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=continental+divide+ride PDF link annotation
    • http://temple.mo/userfiles/file/bopikuzukipewerajosadav.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1a88d78cf---tojadezuvofimofafujasotav.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/bumopokixexubarubofew.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/81149718022.pdfIn PDF document text
    • http://prosquash.by/data/61239153992.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a556f5fb98aba81c5f741e601e1b772/3809279649.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/lovupujuxukukibutuki.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819b4d4405d---molaxukoxorik.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/4m6jp1ui89dairdd040o20sh3m/lazipuroxul.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/1778614151.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/gtp1fni4lgcvt0th08h8q2olsu/74597186408.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/3l4av0irbuaggip0uo4etsjov7/99899011931.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/bd34bc9329ad6ad3d2cc3364cba2a739/rikefazumibaxasuwewevipob.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/71122568579.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/40646784438.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/duwomatupegupo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff6fb9738f---19119382587.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/li56bm8lstq76h68vpati8ejl6/nutifapefejaxafufizupajiw.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/jvg0njk3vtb32vapp412f55jg7/biwikabaxoduwumitupirofad.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/4d43b43fd4657bb86a39b0446704d3fc/roxemegolexavoberubosej.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749884ef730---saxivixuwefarosekejilil.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c274db3b1---suvalodowinetubufibanabuv.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/delajeruto.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba934ceb213---bifim.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/90876144895.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b1b082c3f---sovumedijozi.pdfIn PDF document text
    • 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_off00011042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11042 17804 bytes
SHA-256: 259a7e3bf2766e9c98336fe97b7c407aa6531c2dcda4244cd2ebace0ff89a511
font_01_sfnt_off00013e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001569f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1569F 10168 bytes
SHA-256: fc43f586224ae33589fa023345e974964ddb9b34e5be93ba3924d46d4e218c2c

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