Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f22946713ccd58…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 22:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e6edcf4a1b626af257dadfdaa982f400 SHA-1: c2f7f44096989366155869cafad02a5a33a52a72 SHA-256: 54f22946713ccd58bd47fef595235798f9de390f8438d25c8ea8c3ac1117baba
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads. The ML classifier strongly indicates maliciousness. The document body is heavily obfuscated, but the heuristics suggest the primary function is to act as a link farm, likely to redirect users to malicious sites or for SEO abuse. The presence of embedded JavaScript indicates potential for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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 http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949ec6abe7c---98140158461.pdf In PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/xukejenowinosasifufa.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1f3db271d5ff85d728284ad6478b1567/52589130939.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/47951327176.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160984520e2629---83234774391.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/dfdc22da43050f516b4a1b7de4829c54/82277229480.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/tezijot.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/0p9b4rhid3kno8rk3pm55em2mf/fanamuzufemax.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/guxubadubowemavojewet.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621263119.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/52225419092.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/xemin.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/jipscsc72144nl49jafrvqodf5/muzofulisonemudakokun.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/29485976787.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e265c466f---rojazewol.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e5c47cfd2---rizudumik.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/niwoloduxa.pdfIn PDF document text
    • http://billsky.ee/files/file/77311940058.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c6c66843a8d9403c39f3f66d75e90604/tasijanan.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/2972669639.pdfIn PDF document text
    • http://domainecomps.com/documents/files/sutukebuvejobonovu.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/vegadatajiru.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/72009494241.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/9jcjul24emeuijoap5l1opi85v/zitozabupewi.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/26425541368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=values+and+work+ethics+pdfPDF 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_off0000d969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 16916 bytes
SHA-256: 7833b0eb6d65d88ba70b877d43dbe14eb2d7bf227f634f793711044237c99655
font_02_sfnt_off00011ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 10964 bytes
SHA-256: de0628c45d62e2ebb6911fe1097776d0f49cc3c42fd2b8c018559736b3d0de48

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