Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66e9d5e3b176d43…

MALICIOUS

PDF

70.9 KB Created: 2021-09-29 05:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2efdfb7cac64a3e292eb3c11823a3a15 SHA-1: 162382f46bea5ab49885c3cf9e0332bbad800af1 SHA-256: d66e9d5e3b176d4391ecdba1d8916e16436a020affdc5c6fb52edf6cefedc4cf
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links, many of which point to external resources. Several heuristics indicate a link farm strategy, with URLs hosted on compromised CMS uploads and disposable domains, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://krisoc.ru/uplcv?utm_term=how+do+i+check+wifi+password+on+my+phone PDF link annotation
    • http://fujieshubao.com/zk/UploadFile/file/2021092516184573499.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/43676592173.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/17403484791.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/rekedipidagada.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/buriwofovorikokuv.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/73696797036.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/86399317596.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/68145451813.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/ledunuxulobixepitujiwefu.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a0c50894efb6a73b8ad302876185134/96361487799.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/nisekaruruwopavedizonesu.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/wagajavixi.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/kubokiwuxogezup.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/56606071944.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/jafusaxo.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/moponufafinenim.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/munulikidaxaxepajufasox.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/rafaduvimeperida.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d38f91b7f---49715134317.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/gofinurepugezebulora.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/fegasotux.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/0b7f8828047a36f35e1074ac476c356f/ripom.pdfIn PDF document text
    • http://changzhou.chinatupai.com/web/js/ckfinder/userfiles/files/38400572546.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/paxudi.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_off0000b362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB362 11024 bytes
SHA-256: 70a3beeb9f5e079a15f220d85ed0c9f4c873972970eb275c1ab18b90068a4bd7
font_01_sfnt_off0000ccd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD8 15920 bytes
SHA-256: db3910031c4ce3d7122d495975113c46824526a56dc1a749ebf0755e158acb72
font_02_sfnt_off0000f546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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