Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd17aa96c337d37…

MALICIOUS

PDF

63.7 KB Created: 2021-09-02 20:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c11efcc8bd700ca12132890e11892a79 SHA-1: d062ce6b8baa4b17104d5168c6ae4c06ed8a1bd2 SHA-256: 9fd17aa96c337d37964d308eb1c4ed5324811503695f476e06f3007ab155dfe9
94 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this PDF is a link farm designed to redirect users, likely as part of a phishing or malware distribution scheme. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5438

Heuristics 4

  • 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
  • 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://archism.ru/uplcv?utm_term=self+resistance+exercises+pdf PDF link annotation
    • https://digireg.ch/upload/15082586150.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/vudarekebekivugunanotimon.pdfIn PDF document text
    • http://chineseclothingonline.net/File/liladapugixojewokojojil.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/08/18/salagidepisojabawaxose.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/bevowedomosotapexar.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/sodazisaw.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/dokivegezemuzupijasefe.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/16385316477.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/k4vm6uott9jpso92o25mf5fquj/loxarol.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/jefusubenalodewoteju.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851b25652d3---papufisaxaxapup.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/rujireseluwimibomote.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/0c6fea82e7936de1d8ed3be9658fb7e7/dabiruvuxis.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e2e96ada0---wemodamanoxupawegotamixe.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/57333158348.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/fakogikifagexaxiluva.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6316f9e9---36984367972.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/luferelolinukafuxufo.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086d55e95fc8---sifuv.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/jexibodo.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/dofojowofamul.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/jubolobaja.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/24db6f3689b19efdbb7f3bcacf79861c/nijirexafugilo.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871853d0213---40322128426.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/kifelav.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/govedamidunagi.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/dejisoza.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 10672 bytes
SHA-256: f670ca3e511b3cc34f11a02b33ead61eec48f48af87ca0607b005792b1cd416b

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