Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da50bff6ad08b89…

MALICIOUS

PDF

90.5 KB Created: 2021-06-30 21:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6d7e8f8f4fdb60513e0fef816f72b972 SHA-1: 021663568eaddf8668b10abd1710bd8344e7f5ac SHA-256: 8da50bff6ad08b89b8a2750067ccf359efb7c1e0639e89d901f6fd93499984ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a malicious intent to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/262afc4468bcb412c95ed247fe5287d4/sabon.pdf In PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160baccef3df1e---28149375395.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdcc15a4e5---21020070722.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071391e1d28b---jotetamiguridelugut.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/pewikigufesujevivul.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/909f7461e9c0fe540583c6870803f2a4/lemozoruxugulu.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/pemimewarefiragore.pdfIn PDF document text
    • http://dalaichau.com/files/47118586787.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c8faa534b---faluvakukoravowenafaxilam.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/dekepewoserilusugob.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/4121664381e42e6bc56f3902087ea737/vesometanipofuzujapoxab.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/xuzuwaxa.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/865593645.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d94bc7d7---zosifevamokodepubenexu.pdfIn PDF document text
    • http://cathayred-csr.com/img-cathay/files/fubijegogufu.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/24129898679.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cef2ea081---vuwafenadofejureda.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a64bf67ab7a---xuwusaroz.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/gezolusovanovanate.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fc45f3dbd---juwufebufifobovaregesov.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/76d020a182fec91aef933d458b76abc5/niwizadanemajek.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11c14083d7---jemuzozak.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a97cf4baa04---bomagitokasagikewagiguxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=community+non+pharmaceutical+interventionsPDF 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_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 10948 bytes
SHA-256: 527aba619c24e290089c2a4e916fda590bc84970f2334a6eac6256e7bdce3819
font_01_sfnt_off00011509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11509 18188 bytes
SHA-256: 244a3d407bf2de940402dec92e6ac11ccce4dbba87d52184b95308dda2a7d807
font_02_sfnt_off0001445b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1445B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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