Malicious PDF — malware analysis report

Static analysis result for SHA-256 df658e84f04b9e9d…

MALICIOUS

PDF

96.1 KB Created: 2021-09-19 13:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5b75f7794558d4b6df8cadbb6f11c99d SHA-1: 86e7ab6095262b528c65d512cc13f99e1af6750e SHA-256: df658e84f04b9e9d99b72315d08e8ec1acad7c4a020889299542e4e0aaea976e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection or further malicious actions, while the link farm aims to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://chcial.ru/uplcv?utm_term=practical+reverse+engineering+pdf PDF link annotation
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132107f4f7d9---83316260463.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/79602274259.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/kopuregodik.pdfIn PDF document text
    • http://houselandia.ru/files/22424192361.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/93470805781.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/xuvobafitagim.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161341f56c7631---jatofa.pdfIn PDF document text
    • https://coil.hk/upload/files/26795591204.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161422399940a5---vivanama.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/53313895482.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/9691727161.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a1bda13b36894fdc268383044e8174a/78660863761.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f92e4bcb22---97269109127.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/24349936454.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/pewuravov.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/89213346734.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146f9a9c8bb1---90571119807.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/sapasoxodunakuwagijot.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/71090137261.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/36964296512.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/paxotolejijeloxipu.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/36326904920.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/48289401920.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/baxiwuj.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/luvexikobizejapezabun.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-2/20210902044844106997.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_off00011182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 10740 bytes
SHA-256: 32fcfc9cecba347f507687ed913dfae259ae67a7d308c99d4d451b6758479b69
font_01_sfnt_off00012a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1B 18884 bytes
SHA-256: 65af88b4ad9aa6da0b732783e8709543b673760ca52222f1b0a0eceee0cbbd4e
font_02_sfnt_off00015aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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