Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9e839edf524637…

MALICIOUS

PDF

97.6 KB Created: 2021-09-17 13:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87801a768c70605995ed82dfc2b895b2 SHA-1: 4d83dae6864614fb6cfcb10a5dafe9f98df5f2fe SHA-256: 5e9e839edf524637db83c506c5a6c20cfcc03bc04b1fdd18b249c269cd9c1173
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to domains identified as link farms or hosted on potentially compromised CMS uploads. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the structure and URL distribution suggest an attempt to manipulate search engine rankings or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://rc-mst.com/mst/_upload/files/85852239253.pdf
    • https://exlite.it/ckfinder/userfiles/files/96326711861.pdf
    • http://studiosantomauro.it/userfiles/files/wolodiwu.pdf
    • http://resortvillairene.it/userfiles/files/36859208277.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161392f0aa1586---namubodotuvenekiruxom.pdf
    • http://terralis.eu/catalogue_dynamique/file/46031626725.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/g0kfq5pafgkjilfvejiol5vkfv/veridedodaxutusi.pdf
    • https://dom4m.lv/userfiles/files/xulurupetiresolobore.pdf
    • http://tunesistudio.eu/userfiles/files/fejowigoxetumavatapo.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613529facb076---52218256150.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614110057b78a---kujifaramirive.pdf
    • http://webinaris.blog/ckfinder/userfiles/publics/files/mirixari.pdf
    • http://regmac.net/userfiles/files/41864806109.pdf
    • http://uitetenindex.nl/images/uploads/42687791484.pdf
    • http://www.frank-diagn.hu/userfiles/files/vonumuwizadasejiwifotede.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/7aa7a99d8d8e897304da99392fcffc4a/55345340597.pdf
    • http://autosvilar.com/uploads/ckfinder/files/94323731468.pdf
    • https://gamepinleri.net/calisma2/files/uploads/gokikosutoxuweboren.pdf
    • http://solyaris.pro/admin/ckfinder/userfiles/files/39871754164.pdf
    • http://chinahongji.com/d/files/gusulabozev.pdf
    • http://www.ondebiz.com/userfiles/file/didekiwofu.pdf
    • https://egca.fr/userfiles/file/livofiwigexomolupumeg.pdf
    • http://kerekesvillszer.hu/UserFiles/file/gafafutuzokanufezapogu.pdf
    • http://krakow4you.pl/krakow/files/pafujodimifebaliboxud.pdf
    • http://xatrbio.com/userfiles/file/99747603659.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=free+android+skins
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ad4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD4 16792 bytes
font_01_sfnt_off000132eb.bin
72908192fe81ec592305472bdb02b24605579b7de423a25f0116921e624da78b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132EB 10168 bytes
font_02_sfnt_off000149b0.bin
28827474a1b5b9688cc0f89c08466c5674cad9510755c8f5eb3494a925cb3cb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149B0 18528 bytes

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