Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09d8ef06f1e6366…

MALICIOUS

PDF

99.8 KB Created: 2021-09-03 03:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd7a5061705c2af409ea9527715abd7e SHA-1: 871f304840703aa06ba0effcb278e0c53ab3bff3 SHA-256: b09d8ef06f1e63662ae1f573f803cf27c6832343d35ceea0e248424557887536
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/80259583928.pdf In PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67551c3eee---nimafafojoro.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607370d642201---93780804349.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e2f0c5089---selavutin.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/wurupokununulodavis.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3338396814---51383039872.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/1f575b766e279498506afa243a8b4b3d/batutedidimubox.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb4ee05f60---mosetazopaz.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/78962605647.pdfIn PDF document text
    • https://topupdana.com/contents//files/xedemiriruzis.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b578488cb7---49195521784.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089af533e887---48913651471.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/danebefimegag.pdfIn PDF document text
    • http://asfcursillo.com/clients/879797/File/19749961033.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/gujulim.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/99111146548.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/q3nc7n01t8o79s5oct6j7ku123/91961935691.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/likegudezozolotefir.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/63330860031.pdfIn PDF document text
    • http://gtshotel.it/images/file/35815296429.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/gorozaruwurupejo.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/gosunofetepafipanofupa.pdfIn PDF document text
    • http://maihome.hu/admin1/file/semafini.pdfIn PDF document text
    • http://www.emailposte.com/pictures/74320950403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=catalogo+avon+campa%C3%B1a+9+2019+mexico+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_off00011b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13365 11560 bytes
SHA-256: 33c9d624b92fbe913bd709b56e7cb0b99dba6c76a840a8a18026d4eaeb41fbd6
font_02_sfnt_off00014e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8F 18828 bytes
SHA-256: 585dc290cb6a78142811382ec1163cd54c403cae8430089502c218a0a9beb883