Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38acdcfb64e6e75…

MALICIOUS

PDF

75.9 KB Created: 2021-10-02 15:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7782d42a9fd321e469cb61b2a696c494 SHA-1: 2dd7a53b9bd95610dd190bd70aae118203df6619 SHA-256: d38acdcfb64e6e75db69b35db012e2fcd76615c53366d7815bf15e4afa0c0e86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://sabunwangi.com/contents/files/6011058166.pdf In PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364de83f8ed---1138892540.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/fuzurubab.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/podurugatojadopu.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/jufazutamiwiwoxo.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/91497156950.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/xapavizizajigasew.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/nugavupamokenaporinironer.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/nawanemifukopanazetarojip.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/sasidokufap.pdfIn PDF document text
    • https://desco.scp.hr/files/rikewovom.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/kusotenesodaxaka.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/16978211624.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/63035373466.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161363fd28163a---kitutobuvuzevibajinazud.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dfd6fd1320---pimakofivokuzose.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/97990430426.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/fulufotewifirezevikal.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/5332384693.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/vadabixasopex.pdfIn PDF document text
    • http://info56.ru/userfiles/file/vumosikaraxalakejoduxigoj.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/dubunonogevavojopajuvuf.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/supivojarifuzotexedo.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/zusupajijubodusaronub.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/kotovumukovusawoweduma.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/70040565456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=rotate+pdf+pages+acrobatPDF 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_off0000c17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 10736 bytes
SHA-256: bf0934aa6424ac471a1af2d3a50c9bfb90fd8b7e8d3d766fdf68a57a07c3fa26
font_02_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 18308 bytes
SHA-256: 3fb748c4dd27b4d8b101f125d2b2efb16fa7b5938aa58e6fad467ded3e25b2c4