Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ec1e3f731a6d8c…

MALICIOUS

PDF

118.0 KB Created: 2021-06-26 09:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3e0e95a4b30c9f7b75dec77fb8fd411c SHA-1: d5781660fbb905c50026c8f5d00b262e81c1cdd9 SHA-256: 24ec1e3f731a6d8cfc4276d3d29f1fe6f49f3b09154657a4280e02e23b0ca88e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is intended for malicious purposes such as phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.
  • 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://aisef.org/uploads/userfiles/file/file/pazarikopisavudeb.pdf In PDF document text
    • http://resetimpianti.it/reset/public/file/16919844715.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d56c1b675cf86def9faae23143a07d01/44663407004.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/74834817696.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7abf867dd---jetupitijumokenitubafovoz.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/rinivejazegarerigisaxu.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/2m9102rnvelrcq2hctk91bblb7/zejaxamaxiginavanoze.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/pozoxonitalurutinisovo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5fce9609eabaaf6be68e1e3ae60b04a7/14371743680.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/25011157624.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/247b45f91e8e816afe1009c2ae773bf9/rivagabib.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a95bf0d463---vubowenurena.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/8640497367.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/mosarokibubenimewa.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609b22914dca1---26903193904.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/dkcbbnpf9avatj5regibp5h4no/93959423977.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d712fdb336---68180800625.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/odpah1gki620192837earkipc2/wivedikugiruwazogonebuv.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/5db980448d81f869e332440c0eba3ecc/61982383459.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/539fe4079ecb359d56e7ecba0dfa8bb6/86713982571.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ve2q5c8v0l8pm02u4sckt9qua2/pudidusirugabizozof.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/af9s59qm9sn9ise3g4b71kbeu0/25286842943.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/vorujavibekuraxurezetotup.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/94055116885.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021060800332893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=james+commentary+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_off00016d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D58 10748 bytes
SHA-256: 639a6a8423a95e677e46d2fbbd1ad6727486a57e41c69c220f01f9e752c42a1d
font_01_sfnt_off0001861a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1861A 17200 bytes
SHA-256: 518d2157565274781345a12dafbbe9be13a7238af36e784d3e7f7db0d5659134
font_02_sfnt_off0001b2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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