Malicious PDF — malware analysis report

Static analysis result for SHA-256 2551f5e100d05425…

MALICIOUS

PDF

70.7 KB Created: 2021-09-09 06:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6d1dd880299d538dbad1059ef3e7a47 SHA-1: b7ac22fa3ab085c1c87695c02ca21c08b8c604d5 SHA-256: 2551f5e100d054256fe71fdfd2fe810252b5f9683e10622b327405a9303040c5
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting. The ML classifier also flagged the PDF as malicious. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6611

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.
  • 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
  • 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://philabc.ru/uplcv?utm_term=1+largest+country+in+the+world PDF link annotation
    • http://fra2ange.it/userfiles/files/59171935594.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/24690201308.pdfIn PDF document text
    • http://centrons.com/uploaded/file/19702068376130301fe1038.pdfIn PDF document text
    • http://gro-felix.si/uploads/gidexesomu.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/87550911947.pdfIn PDF document text
    • http://kozlovka.mebel18.com/uploads/files/vuwapuxixotaruzimasarodo.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/28854245800.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/retomufa.pdfIn PDF document text
    • http://castel.lu/userfiles/files/15023440129.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/54491783686.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/bobalovedulav.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/72601496726.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/74077849796.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63741863371.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/rumezotivezevanolof.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/01fbb4bebe27be5fc15f68eb0e9dee50/14030749362.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/61261994866.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-8/20210908115039856275.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/sotiwuxavivi.pdfIn PDF document text
    • http://meta-min.com/files/42955461066.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/jaxav.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130fd8eb5f9f---39663374278.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d42e99129---bofojawuwit.pdfIn PDF document text
    • http://jainfarms.com/uploads/68363284456.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_off0000fe71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 10904 bytes
SHA-256: 2263ce141b0634478207120d43d7b62f7b8369e7be0f17d461aed74dc80d039a

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