Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2728c7b068feb8…

MALICIOUS

PDF

85.4 KB Created: 2021-06-27 09:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 622b3aa489fddcb58374699ccab73be1 SHA-1: 98eac26b8129da5e7ad15397e0561be1c36ceda9 SHA-256: df2728c7b068feb810216b6738099acbdb58c7ef661daba771293da766dd7e92
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button lure reinforces the malicious intent. While no scripts were directly extracted, the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9b3d0384c---gufarolusenudagiwaga.pdf
    • https://bloomeng.com/uploads/12255713547.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6ea52a34b5f1089ce249d0cd491638b0/21118098866.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9a7a0607f---20553156765.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c925710b181---72256396545.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608064737aa1b---85571018800.pdf
    • https://tajeer.co/userfiles/file/48554380041.pdf
    • http://avtrak.ru/ckfinder/userfiles/files/juwige.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/fd5a549cae001de38e6f61c9d80f7cb5/davigujotironoze.pdf
    • http://transbur.ru/admin/ckfinder/userfiles/files/33657140739.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c75c3fda1---23093217596.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b268515ba---jigop.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a18a5ba87ce---95508056792.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8cfe4b842f8e93b1b5c486b717826f21/36192854366.pdf
    • http://guowangcable.com/d/files/tebipivexajulidojireba.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0da6c21c5d18741552d71e4f9b59f618/86053351148.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/45bab0a02806c124d6124544c418ef02/sudaxokeniriv.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/bcb0b1e6cb7de6daf27c2c11a7b84c73/1450822280.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16070064303546---24939548138.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/ailqu9ta10pqnbejre99e9cgi7/95905538867.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a565783a296---29307417019.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916f2211f85---dumusi.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/40e0375c9af380b8c44d298d8d7a6ffd/bizama.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/disonufip.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4e8aa47ebe22e2664ecd0ab9d13ac5b5/39266984095.pdf
    • http://mjsolankifoundation.com/fck/imagesfile/kamen.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gta+5+free+download+for+tablet
    • 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_off0000ebd1.bin
4589ee1a03397c8cd52e192cced14d180664937dc0c947d6b3994595e241701a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 16920 bytes
font_01_sfnt_off000117f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F9 16792 bytes
font_02_sfnt_off00013010.bin
1f01feb13afda3aee87aa38d2bf074b4ef7a2c6d823b6527818ee1a4808a2255
pdf-font-stream PDF embedded font (sfnt) at offset 0x13010 10484 bytes