Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c989d157910a5f…

MALICIOUS

PDF

92.4 KB Created: 2021-09-03 08:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2b013cb6606d164506bdfeb125bf7d81 SHA-1: b966f0cc58c4c5b7d6296dad56e1df6d61d6f1ba SHA-256: 43c989d157910a5f99a54e8677e43dbac6f292f2d596e5db9550b315bf6a5398
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://infrive.ru/uplcv?utm_term=unifi+controller+manually+add+usg PDF link annotation
    • http://studioriboldi.eu/userfiles/files/26499723121.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/q76cbvutfa2l6bblfp6hpiq3p1/lepexok.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/90847288558.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/nalidevalaxokegebobib.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/f90c7a7d28161458bceefe59a7d18a92/90480240034.pdfIn PDF document text
    • http://cssh.es/img/file/18433474580.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/07027ce6cbed64dcdad281a2369da96b/25214694044.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/10706984782.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ju1huf170lbq5jjs4r9gr15occ/sagixivutamorubu.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/gogugezuwimepides.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/75188125628.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/67359149368.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/romasabudor.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/2206185632.pdfIn PDF document text
    • http://irths.com/upload_files/files/91131163886.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aedb861a3c---tavif.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/67045961528.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ebbdb268d5e41d9619e8c8a3cce9e9f4/kofijoxudoxaxenanadulodev.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ec946a72f8479792a96e402105f50cd2/jawedimon.pdfIn PDF document text
    • http://fxmeat.com/upload/file/c11d3da9b08782278f11ab62ec350ed3.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/29529288905.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/6aff9193fd4a1e6cd3f2b5482f1c1e13/21535067225.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6bfd0f2473f9945f921939d91a2f04eb/velutora.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/wonobojomukimufurotamomog.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/47720439573.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_off0000ffe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 19076 bytes
SHA-256: a8beca82fb7b49741a7def613ceec4800305bb5544560ae79e5cad4d696f68e0
font_02_sfnt_off00014a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A60 11040 bytes
SHA-256: 19e7cc43dfc521e39c3f5a4c32547b0cc0a732f41048cf9e3e17d28138e35349

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