Malicious PDF — malware analysis report

Static analysis result for SHA-256 b756a431f2f52df2…

MALICIOUS

PDF

82.3 KB Created: 2021-09-23 02:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5bd6a847027efb692bf50529caba013b SHA-1: c54d679723de6e77db426000252d56a366f752c5 SHA-256: b756a431f2f52df2c470b882048b45848de462271938bca8b5e98ef108759662
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://laborke.ru/uplcv?utm_term=dark+avenger+3+mod+apk PDF link annotation
    • http://meyanko.com/userfiles/file///85500140054.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/vamum.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/tamebasulafafiwabizoteb.pdfIn PDF document text
    • https://avflash.nl/upload/files/90972840677.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9a85be20---63376450174.pdfIn PDF document text
    • http://aweibel.com/Photo/file/86047407609.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/fisam.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3740530564.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/8525224336.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/vomusisabepakirerukugog.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613986ae53da0---mililuniw.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/42451808724.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/wagigeligenefowuzesuvowa.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e593d8e087---xigadekexowopuse.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/rexuworebomar.pdfIn PDF document text
    • https://isosklo.cz/uploads/52855307609.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/67058207308.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/munozo.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/majabisodulonesiteduf.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/fusivonewekofem.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bfc279f68---95057359900.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/rekewobiretowiki.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/limukiruvoreni.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/xegokepuwerawaluliw.pdfIn PDF document text
    • 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_off0000d2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 21512 bytes
SHA-256: 064f5d7839b16cb9077ee72102f64120225b82e6bdc399e0e222798f03664368
font_02_sfnt_off00012371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12371 10660 bytes
SHA-256: 58ce9b83a58fec88a3f2f372a8f00cc488c2bde13521fe73b1ad3fef02500ff0

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