Malicious PDF — malware analysis report

Static analysis result for SHA-256 a724e8d5ad9ee390…

MALICIOUS

PDF

72.9 KB Created: 2021-09-06 18:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89c72a8b468a1ac34a442607f5e3e8eb SHA-1: 2b522e1cd34f891bc955289b77edad9b27e7ea17 SHA-256: a724e8d5ad9ee390d0457e32fafd797fa45a9fa23a2b7c8cacb951e6133717ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute further malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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
  • 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 http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/desofaguzodexajad.pdf In PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c209ee87b1b---wakamixubujanonu.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/poxebitefevofa.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/0e1b392dfd33c901699f20a2f41b9ee4/51936499949.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/pavokudubifeg.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e76ce1341d0---42954875916.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/dimumelotuvukuno.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/62257896964.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//74187846968.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/69e752c4572180e570b43ace0e0bcdd2/sufuwo.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/vuvapokumabegukek.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a0d862258---80296269289.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/jelefinudepugosuxegiroje.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/5121666688.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/31054664183.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ba0633f24---leziwavusopewivunitixa.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/17412269119.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/dutukades.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda788cb8d6---90064420978.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/fls6jtcv9uespbogkhmt5r79l3/75339832788.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e41b5ebb842---6937522403.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096001ebcfef---23620113886.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/79027757291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=carruagem+de+fogo+partitura+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_off0000b88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A6 10652 bytes
SHA-256: 04dd1ee144a696135b0aded331359a06f723fe6e1d565956fa86b7918720094f
font_02_sfnt_off0000e8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 18172 bytes
SHA-256: c11f54ce993f4056571a4d67ee92023e6dfea305c48b80101f2fb744ac099a6d

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