Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eac3838dc1a247d…

MALICIOUS

PDF

87.7 KB Created: 2021-09-06 05:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a6c190c8ebabb802128bd39c92bab8a SHA-1: 505bcadbb169f09400f8168d0a789a8f59e2f8d1 SHA-256: 7eac3838dc1a247d1173305bb629b7a337d60e026ea53c05481b3ce73d1b4361
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection 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://wannawwannie.pl/userfiles/file/nurugokegopapij.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e093fc0d9f4---63270370070.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/bokojujafisedamewexetetuv.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b12cdbcf95f---jifitugujivupedowen.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/8376025709.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afec7027aa---91538391370.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/af7561c6b391fbc4d4601aaaf8de328d/49582900411.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072254bdc0f4---97590711120.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/vined.pdfIn PDF document text
    • http://kme-kme.cz/files/file/54605797992.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/30148749097.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/63953460888.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/nadepofopabasotajat.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/rugegavujubi.pdfIn PDF document text
    • https://masihpt2.com/contents//files/visutozetu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b65aa123bfe---68021664300.pdfIn PDF document text
    • http://hongdacable.com/d/files/12213855919.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/36004088363.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/20875388775.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/levunavigigesavu.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/9772761591.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2fd0abcab5ed028f7f29b935734da0c3/40095361677.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/guwafebokuvusulejiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=benefits+of+social+media+on+youth+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_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 11052 bytes
SHA-256: fbdf7c1738839a3be6e45a17afaaf3b7d28c24bf7442685729cf967cd1bce64c
font_01_sfnt_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D0 18412 bytes
SHA-256: e4bfcb14646de863ebdf00c9f056061885de2de6ee4d68dd74b3605ca04a1fb5

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