Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5336c293bf416ae…

MALICIOUS

PDF

63.5 KB Created: 2021-10-06 15:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9b2bc039b4dd86fb7ce1f2d90a10671a SHA-1: c9f198d86580aa2ec6c3687098c940ed45a855d0 SHA-256: d5336c293bf416ae96dfe2f2ecbd559b42c82c3f18ff4272632d44d883ce5c5c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to external PDF files, many hosted on compromised WordPress sites or disposable domains. The ML classifier also flagged this PDF as malicious. The presence of multiple links suggests a link farm designed to redirect users to potentially malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7964

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://cructi.ru/uplcv?utm_term=petechiae+viral+infection PDF link annotation
    • https://thefertilizerequipment.com/d/files/wijonovujigadixoj.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/bakezib.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/40796657638.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/dofezoridedap.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/redaxotisafobuboresux.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/mekinejotiper.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/be6jfeba57lgmvpdeme2ppk9vv/61526199182.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/bomom.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/21314247163.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615402d3673d8---sojaxuxur.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/godejafuv.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614274903324a---32125198248.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/91222236240.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/rawagudusakejilusow.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/gofejow.pdfIn PDF document text
    • http://hoachattn.com/image/files/48539048198.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109140304588867.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/fiwexe.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210922_021121.pdfIn PDF document text
    • http://hmed.vn/upload/files/14075503030.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/33966397321.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/23860753674.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_off0000bf4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4D 17852 bytes
SHA-256: 3f2068fc1ae2cc849401a8f49c91668b03bb37a50177db9d313dae9b5551797a

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