Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0225a6ff7e2f743…

MALICIOUS

PDF

87.6 KB Created: 2021-06-29 00:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 23990478c8f5b9000370aee4fbc08f7b SHA-1: 6f3c69d00705ec8ed24ffe055a97fb2d76e6e706 SHA-256: a0225a6ff7e2f7430da8f471e9a320dffb10cc944ba2f5a87a0b5cc330929d3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous external domains, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://monkey-do.net/userfiles/file/17700632403.pdf In PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67153989956.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/f6e8c36a7b79291c858a671cf265e093/84374016170.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160839e153d47d---71863247485.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xatepufifamegowidide.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/benovuvarigurexo.pdfIn PDF document text
    • https://bamor.org/userfiles/file/dixigedoro.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/58qhnc7qrk00j3pvukird2uvji/guvawifinukeduduvekur.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160949bac76917---88257451301.pdfIn PDF document text
    • http://rotang.net/userfiles/file/vovataxape.pdfIn PDF document text
    • http://premium-t.info/files/files/91737730408.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9edd1968894d71330d44c89dea183db5/goxezibuzevopoginopita.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/bowifipuru.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c5c4d2bcd407b029a37ce3d1a99c4ca4/taresareb.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b56f4c037---goriperijesurotuda.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/zetepimi.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/lozogusixonu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7sm82voif75km29ff5ae2o0n47/zewunifowejobekuji.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/45883583921.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/2878793832.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/138e28cb1f825bf41a33e3955bd0ecf3/zaxoz.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fb617c4d4---47103833222.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/gipusenafasavipitilasuruv.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///34726839161.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/d720769559b0eb9ec61e7ca3f6e15165/25736276330.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20c021af7f---95547783186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=isentropic+work+of+compressorPDF 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_off0000f073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF073 18068 bytes
SHA-256: 3523181fb790ccfe3204100a767c803c7551ecb587732e675fc224d708cd32aa
font_01_sfnt_off00012094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AB 10564 bytes
SHA-256: ce8423d94cfbcd31dbe3298dd2d6bb7b35eb860c9d4bcd23b70442790a94f253

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