Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea9ff820696e37b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 23:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d68ccde725440b1a44c7ad17c23653be SHA-1: 9d04f97dfa979f2c8f07e7f0a75a9dcdd2418f4a SHA-256: 7ea9ff820696e37b595fdd006a1a4a3f690e44b3d1c13df7422f18f5633bb143
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://jooli.ru/ckfinder/userfiles/files/43075870503.pdf In PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/20020432110.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/1483152766.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/pavajobemesudepoka.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b6c22781080f6335cbb93261a89af80d/25639422221.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/kaxudulo.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/16827986935.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/99820919264.pdfIn PDF document text
    • http://gugugroup.com/userfiles/91788917936.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/68182114432.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/padakowefalakunojamu.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f999dd09462774460714ec0b0f79859/89386886997.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/kekozok.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8489e17a8---kogupebekofokotafixad.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/xabuwa.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/38c143f90e0bf6806478efb7b7131d19/sezesuwarepibuzuf.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/kamovefokivuzikiz.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/8062709624.pdfIn PDF document text
    • http://pcwest1980.com/clients/9/9b/9b13e9c1eb96aaf026ead536bb80a376/File/kuzimulakego.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c50275d817a---19852056619.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/38696978281.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/binalilikijilib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=heterogeneous+testicle+meaningPDF 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_off0000e001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 10664 bytes
SHA-256: 8a2db06b9ecc6920b64b8d92c1aed181d33ed3f8bef95ccd66fab8e4b6068b5c
font_02_sfnt_off0001107f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107F 17868 bytes
SHA-256: 2a19014c5ecd3cbd9137105798c32e8212030cf8f455f4028184fe2aa3c9a3d2