Malicious PDF — malware analysis report

Static analysis result for SHA-256 65438cef9c694cf7…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 23:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 97169b38bff0b2a95458f0205e0bea67 SHA-1: 8c7cedaee001be589c20d8e023a1bb533aea1e7e SHA-256: 65438cef9c694cf773564da9b1700413202e6383ff5b883713fb5aa7e54232b6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating a likely attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://holidayservicemarsala.it/userfiles/files/meferegupesapuxavaxe.pdf In PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/39682991327.pdfIn PDF document text
    • https://linker.tw/files/rukujotezigoz.pdfIn PDF document text
    • https://verner.lt/images/files/68844875899.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/kojotasijalofiziluzujo.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9d844d194---66038369837.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/raxipozer.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161462f0fab710---46906457903.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/71039407663.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613db59a97960---50751041318.pdfIn PDF document text
    • http://feminella.ro/upload/fck/jikijibebev.pdfIn PDF document text
    • http://zenithmetals.com/files/30526658295.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/sosuwugeragojuwojumujig.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/nuvitovipemufoxo.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130cff04b08d---61323192960.pdfIn PDF document text
    • https://insp.biz/img/file/subodixofujipivif.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/faguwapudepitopuvi.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145001024196---72692903928.pdfIn PDF document text
    • http://gibisch.org/files/files/83087535522.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/97953070212.pdfIn PDF document text
    • https://agatanorek.com/files/file/52832089959.pdfIn PDF document text
    • http://24cvety.ru/upload/files/batupud.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/komafunose.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/90087111933.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/kozaboditipetora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=dungeon+hunter+modPDF 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_off0000dd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 16348 bytes
SHA-256: f66850425c84f972ddffdfdb47089eb5a5e521deb0573c407be77ac6336b23d0
font_02_sfnt_off00011fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA6 10328 bytes
SHA-256: 36342af08c3de07228ac5c6b05806f11bd84379e969ffe9441ef0a5853aec0b2