Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac0c2c90f1227b6…

MALICIOUS

PDF

89.6 KB Created: 2021-09-13 16:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 51a60c8e76f0ec67044f82a8a2e33d28 SHA-1: bf22c90b257f3e215ee7fa8d5f22b93ab4369b5a SHA-256: 5ac0c2c90f1227b69b539595f787a805b263b4f6d67599ca46074ac5f6f7a398
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests it's designed to lure users to external sites. While no scripts were extracted, the presence of multiple links and the ML detection point towards a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://manorhair.com/uploads/files/202109011852045173.pdf In PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161323d1512d45---sewomila.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/2111887829.pdfIn PDF document text
    • http://briztravel.com/upload/files/70478911728.pdfIn PDF document text
    • http://allycatering.com/userfiles/56656198017.pdfIn PDF document text
    • http://klpa.net/userData/board/file/renumalujitoxabiku.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/gisanapudujejexobexi.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/sejutirubezotifopumijeti.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/18683006539.pdfIn PDF document text
    • https://euchebnici.com/img/file/bavilubasutokufabome.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/pipabajinerufujonegi.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/42588998562.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/zexifozu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ddf51aafd083c70ccbfa9e22686262d0/99485616095.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210902093839.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139535f3f1da---57346788175.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/xutonijoxikiforiwuxikedot.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/bopawapabusidokuragoxoz.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/kizutubonu.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/dafekaje.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/sovevide.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/63932872151.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/44922897890.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/89235235867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=watch+wreck+it+ralph+full+movie+onlinePDF 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_off0000fa10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11227 10916 bytes
SHA-256: a73585b8ce1e3b6b5ea126d6af9a22480d4f1ceb1b612156d7c2118f1cff7e60
font_02_sfnt_off00012b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B45 17596 bytes
SHA-256: 8ce6acd31a5ee971775b5b8c302e53ff297764f26e5b917343398ef69195a266