Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f40ef18a73fbcf…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 09:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f1ed1a68b5b2ea7fe7f9e54aefb179e3 SHA-1: 0b8a3e7fb1c9b7af73585de560ea7b83fb2b2970 SHA-256: e9f40ef18a73fbcff34e42bf3dab6f4ce691af169a1e34b81cfc35c89d7e8571
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 designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://aksaaydinlatma.com/img/editor/image/file/23823305868.pdf In PDF document text
    • http://poltinka.ru/userfiles/file/64475936073.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/nikilufatezojeb.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/89510037426.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/40824446864.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/bes231jc22dnlmuhdhpl7ohig6/80213370823.pdfIn PDF document text
    • http://juha.be/_files/file/xixopapekinedipat.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec11749fe---tasodelumasazapaxisaji.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0b852214e---fipoz.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/julisinuvegomogubuxib.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/bp91r4dcj1krdf5h4ul9qckol7/43138523118.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/77475534752.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/fuxoxixajagixadilokux.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/polimoxagixijuxaw.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/16548789654.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/6559434059.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/bogitiv.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/wejafewifewepijibew.pdfIn PDF document text
    • http://kyea.org/imageuploads/80430552230.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/47871604011.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/05b04be240804ed8807933af9820dc3e/losimofonewupo.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/gc49fgf3bbf5d043i50v6lr48p/xidibilewuga.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/45b1a07af15ee98ce5c05553b36c29a1/wawedewukowedagogagisoku.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a30aa0e1cd2---71414734405.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775fa377540---69552069445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=journal+en+anglais+pdf+gratuitPDF 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_off0000d48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48A 20516 bytes
SHA-256: 3a90db68c7eaa7eb68bdadaa557e2e74ef3e26b60a1c862ac418463625a87fe9
font_01_sfnt_off0001076c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F83 10764 bytes
SHA-256: 4d06d8d696b4000b74d6c0586e937284d3f572955f634629d49e5ade7c7f6bde

Open this report in the interactive analyzer, or submit your own file for analysis.