Malicious PDF — malware analysis report

Static analysis result for SHA-256 b127bce5ab560fc4…

MALICIOUS

PDF

85.8 KB Created: 2021-08-16 11:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 11061b9534656256cbfe80c06f81f40a SHA-1: 8add724d79f7e72b32a909793ccde646b91e9085 SHA-256: b127bce5ab560fc45427acca23110f0e5ba46fada2becb117ad5d32285a570f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://synerhu.ru/uplcv?utm_term=balancing+chemical+equations+worksheet+%232+classifying+chemical+reactions+answers PDF link annotation
    • http://podwierzba.eu/ckfinder/userfiles/files/pogojebawadewajawut.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/47584851554.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/gl2qm1ecvhcp608e4h6ph0kk93/23377826029.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/saminofuvujipasodazogivip.pdfIn PDF document text
    • http://anm-av.de/uploads/files/44935895450.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16077bdf3f0672---powufenek.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/595a576d112d04fb3cd6d32c7e385a66/tawiwupefaxedobixibegut.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/50174236150.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/nafumafif.pdfIn PDF document text
    • https://cheesykeju.com/contents//files/zaguvidegolik.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8b5602b4f---wekuzedo.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/11825977995.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/e98cb11cb35df83949faa65e3363df1c/81724203680.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/88c00e80ae92f67619a6239eae01e03c/demosilarubaduxenasex.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf213572c---40679288854.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b24321bcf---mefipunikenegedibiv.pdfIn PDF document text
    • https://shidoremicrosys.com/media/85018884378.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f0b223b70628714edf857bda3a97e980/tefaxib.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3fcc94be06---90469817563.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/7lreqeqirrc0ln0a0mjav1kpfr/dizav.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/39a926f0c01af1e10aee92bc0f7a4926/jutudi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0f84a6be4---67686416450.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1f3299f37---19455097241.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/79688313800.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc315be27d9---minujufobegokop.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0047b7136ba3f972fb7bd7fb367d7f20/wiwalewodejukuj.pdfIn PDF document text
    • 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_off0000ea1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 11156 bytes
SHA-256: cd32fae8a4cd29e74422689ec0b4a550ac31f9a11787d5aab2f6afdda3194ca6
font_01_sfnt_off000103c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDB 16796 bytes
SHA-256: 36019cef25ec9a8da8587829f7ae87b321050e2d457316e429b9ad9c5e415ef7