Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67357ee68643e13…

MALICIOUS

PDF

71.9 KB Created: 2021-09-09 16:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef3b799ba2a0395116034e65704283df SHA-1: 0e1d84f383d1b2ca9371047e0269fceaebf70ef2 SHA-256: d67357ee68643e13ba22a0a66e059a087eceda1f96e86af1fccd5a18a9862f58
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The ML classifier strongly indicates maliciousness, and the presence of multiple external URIs suggests an attempt to redirect the user to a malicious site. While no scripts were explicitly extracted, the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=dream+league+soccer+apk+data PDF link annotation
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3a85c99170b435b2938a29f916755f02/10432061550.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/zajevikun.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/pezapesabewawoma.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbed8bdbf---40607482816.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/jiwakasawufata.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/jarevomufufadokijigomori.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613072df115b6---pelezezelozujoluxulugupo.pdfIn PDF document text
    • https://km2804.com/ckupload/files/leviludoxuguris.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/zajotezizid.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/durul.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/gerokejuriburutixalo.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/wetegogajetej.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/nusatiwowunipadodifonuduz.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/duduzededul.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/miranewonokewovafil.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/59420935990.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/76713667089.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/58334753109.pdfIn PDF document text
    • http://mamitobe.ru/files/file/51117779697.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137670ade09a---21640689406.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/voletafijeru.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/78565089306.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/69952333546.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/xetebisupolizizipugudo.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/danujawizopup.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_off0000b870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB870 10852 bytes
SHA-256: 56ac81db770aa3a94cff4c7c5ccb26a6222babf800b32b71cf0354bf9603f69f
font_01_sfnt_off0000d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 15884 bytes
SHA-256: a4bdc45a3682539c84111fb1be24568f848b613ec0dcff370334dc0d37a5ebec
font_02_sfnt_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1