Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52f035a97d337cf…

MALICIOUS

PDF

98.7 KB Created: 2021-07-06 22:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0ae7509e88888e1f7b27284823ddca90 SHA-1: fa7a07c6a115b15bdebc4096a5007428f9c3bc64 SHA-256: e52f035a97d337cf94119e38a09f9ce663886e8b2858bf2853e3c0548501cc84
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript likely serves to execute malicious code or redirect the user, while the link farm structure suggests an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b3fd78915---gejatidoxadobezegizami.pdf In PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc71fcdd7e6---84155773462.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/4146514659.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/janotarelu.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/71156376769.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/289b092d053db61209c9564ed1c571af/vojolelefakamojagimepove.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/furoferijaj.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609faf61a9d9a---vovedetinowuvorefubixidub.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9ae00375c---fagesavigegoxutepomib.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d290572e8---nizelugabuwisezad.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/nixefakuzofix.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/96139076818.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/86897355492.pdfIn PDF document text
    • http://didopack.com/files/gizalixurumi.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb142288e3---92359208653.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/vakefurukogu.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3b85d0afc---90040311774.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec6bc769e4---35133282560.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e851366d3f---jaberafokuvilo.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d672e9f053---potukikekuba.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/tofotasetojav.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16096ff33bd13b---wonuw.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e95aba5e3---womejaza.pdfIn PDF document text
    • http://blueyee.com/upload/file/111622511536.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/sorazebejovirewefalokabik.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/h3rchprgs9bnk48sd17onto9fr/28613555304.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2c3c0c96c---70683538083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=warzone+community+discordPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 10752 bytes
SHA-256: a7d686ceaa8084832f0137574155d5dfeb4fec2cacbfced748e27598fc2d2114
font_01_sfnt_off00011a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13249 16800 bytes
SHA-256: f6f77078223ad554d1f10ce79b0f38adfc4de42526e49aa066285fc745ebf1e1
font_03_sfnt_off00014a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A27 18552 bytes
SHA-256: 2995b91532546a55519206b4e4e87b5e508880094435488ee8cfb4e0848cd64d