Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c09937f90681f3b…

MALICIOUS

PDF

78.0 KB Created: 2021-07-27 06:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: bc61be3ece8c24c1b832e2ebf793b2df SHA-1: 1b011dcb7e8bd8ce59ccf02505cfe5d38c93bb2f SHA-256: 0c09937f90681f3bd2b199d12e2abbc90a927df55ff36a8596873d6b93b7f33b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the 'super-forms' plugin. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on compromised CMS platforms suggests an attempt to obscure the true destination and leverage legitimate-looking infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9517

Heuristics 5

  • 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
  • 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.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/3a8de8e6d4b20fea6efb9b103b62b518/jidizuxapur.pdf In PDF document text
    • http://bitite.lv/media/txt/122/file/mumubopenivesomaxuron.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/1p0j29oq7sm26kodimpdqdhiru/4008610426.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/34501328519.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hfm5o6g6po1o64t1na6l96hd43/71304807100.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/qouioro95e0q2iicso5ihnq4lh/vasexawapewe.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3ff76574a---mufufezagabetenowebe.pdfIn PDF document text
    • http://araonline.hu/uploads/file/vodapubejodegudekulagu.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/61595074644.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/bolev.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/32024823207.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cc99d3014---63316383851.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/zozatot.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/al4bf518onstdq9v502frq7f2o/legipodupodezezut.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/155j8iuji3auenkio3p5d7gbsv/mudegumeribufugajekixitat.pdfIn PDF document text
    • https://tavio.ru/files/file/6569189128.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/gileno.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897298a102c---fugolox.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/d34fe198a4e920203a1e82e53db9fba2/jugiborafuto.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/3426ec65fdb15dff8a60e3306b44fb8e/lumazotoj.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/71567802831.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/wajekoxisopoko.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/tigozolabufuvejubozojo.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb3ef12eec---levujomonamizopoboxukojux.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/30527842031.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/79076891326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+the+novel+noughts+and+crosses+aboutPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1