Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf25c8e91326908…

MALICIOUS

PDF

73.7 KB Created: 2021-09-13 21:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 78e835bc8652063552d40e0926eb4e97 SHA-1: 945d19ae55fc5d009eff8b253262978259f96b35 SHA-256: acf25c8e913269080002f74c6cb5c18b7ac4443c1dfe5e15898cb48db07ddfbf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. The file also links to multiple compromised websites, likely serving as a distribution point for phishing content or further malware. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a87de7705e---98293831197.pdf In PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/68111566572.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7a2bba3df---kagajuta.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/wozasitefanuwika.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/9988798229.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/jetekikubulugotagupuli.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/49177738124.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/60332639149.pdfIn PDF document text
    • http://poliinc.com/upload/files/bukufuvijijiv.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/62793948018.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/tizozuwikafevebogavori.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/47013740027.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7cf40dc3f---65435956655.pdfIn PDF document text
    • http://special-pharma.com/upload/files/vipuw.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/nefadixidomiwunutuveze.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/22561408512.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/55979669292.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/71516811200.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/21861739866.pdfIn PDF document text
    • http://wwsm-us.com/files/file/14306546098.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/fufogoje.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/934dd8f39cf4165ed243994090fdf809/82909828990.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/xotiwunosezinaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gk+pal+physiology+latest+edition+pdf+downloadPDF 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_off0000b82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD046 11008 bytes
SHA-256: 220415391d845825202de9f24064261e3d9b51c9d4a3847fa6a153a7403b7dc1
font_02_sfnt_off0000e9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BC 18232 bytes
SHA-256: 2aecd791c7c2ffcbc6046624e40fd5b745996cbfac2ca12beb8230b3e783d6bd

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