Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5a1e5fd1742815…

MALICIOUS

PDF

77.4 KB Created: 2021-09-16 07:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 08d0f3ae6ca28931a8eee19f6dd5162b SHA-1: 61a3b2280f549556cfc18a4af127187149e46085 SHA-256: fc5a1e5fd17428156247bd6f18435e458e561c39634997f19699b9dd870d593b
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 or disposable hosting, indicating a link farm for malicious redirection. The ML classifier also strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pixomot.ru/uplcv?utm_term=mi+android+one+model+name PDF link annotation
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/64855193095.pdfIn PDF document text
    • http://centronegozi.com/public/zujefajudobofakorow.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/xiparokejefoxumizewijos.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613e46b98cfc2---pudatekogegemubukabiju.pdfIn PDF document text
    • http://poorclarescork.ie/images/fejidonige.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/57947682333.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210913_06E662BC7539C1C7.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/59934226691.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/87496914015.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/43124181750.pdfIn PDF document text
    • http://tayles.com/uploaded/dijezinakafuvegebapevof.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/86685773337.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/lawoduwodusuluji.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/juloripurawara.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161310926c803e---44681922440.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/niwulizuju.pdfIn PDF document text
    • http://df-2.de/images/daten/file/dexijafadepotuna.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/35365872050.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/5298c9fac7005632e1fa9fc9a3ef9ac4/xebaduzoludedu.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/13608815588.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/zojitamakukimona.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/jevexoko.pdfIn PDF document text
    • http://freestyler.cz/img/file/ledorazabirogipidi.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/xiwiwemudozaduvojuxara.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_off0000cb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8D 17708 bytes
SHA-256: f966c530d050bd7df1925ee3f890e7f714130878edcd2075eae42255adacb409
font_01_sfnt_off0000f9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E6 10136 bytes
SHA-256: fe175aea39b82a090806e82e7fd7d9ccae9e2271d65e622f51131425a7709805