Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9992503515a22cb…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 04:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5fc898e9658a0583d761cdcf181a3cd4 SHA-1: e2e1110783dd9347df0ed8704f41238bdb7045fc SHA-256: f9992503515a22cb132236498579c26c5d0fe7690486ed2bdee7ccf8c2272495
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely serves a malicious purpose. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://artasedanasingaraja.com/uploadfck/file/delimowopozelopasoj.pdf In PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/0dc54307b7c9ca000204a5d382d4a32c/57155491627.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202108281043306507.pdfIn PDF document text
    • https://kultmotor.hu/images/files/wenerosopanikujemeri.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/81533751408.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608569994f854---tuzajetizakad.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/de79e9696404aaeab478d5da21201768/83413047916.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/dofatadapiz.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a834df920d8---mevur.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/jaxudixuxofamaterepibigun.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/lbdmmdn3dq5lbm2stiq618v041/kufuziramurejuxip.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/94119758120.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/0fuho2cuaboi1h32h1964k8du5/54083998545.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/pexut.pdfIn PDF document text
    • https://cargotavio.ru/files/file/lojoriponamunojujig.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/98e8df9723abe8d0e383309d8de554d0/76046576819.pdfIn PDF document text
    • http://kotolantopeni.cz/file/suvivizebekusonub.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/20845714157.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/c2jo1q8nalv8hv6cdoq8duo0l4/nonuzaxaredebilagogujur.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072e1f2a3f2a---78697390518.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/41773481007.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/dedaguludutoxim.pdfIn PDF document text
    • https://efnnma.org/files/file/45472996399.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8f850a569d474af689d26fa77ef7e2a3/76810872659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=main+functions+of+hrm+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_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 17176 bytes
SHA-256: ebc56eb93e5460f3fb38dda9ad0092b011790351b4480ab65b19c747bad57d16
font_01_sfnt_off00010e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 10800 bytes
SHA-256: 54e994d3df478a1ed1d688cea08782ee1f2ab102144a94d069843bfa9be9a739
font_02_sfnt_off00012728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1