Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e71081706766a46…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 19:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3782722bdb9fd496e63957093e1d6754 SHA-1: a902295b057595bd627546337d4debca8d33626d SHA-256: 2e71081706766a46f5f596eb55226fe67a43ef7de0d458241287169843f1634f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The ML classifier strongly indicates malicious intent, and the presence of link farms on compromised CMS uploads is a common tactic for distributing malware or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pistant.ru/uplcv?utm_term=pokemon+platinum+nuzlocke+rom PDF link annotation
    • https://artedeeducar.com.br/ckfinder/userfiles/files/jepim.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/tazusijiv.pdfIn PDF document text
    • http://geoman.cz/data/file/bobibowufiseketujiw.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16130ca80f3eb0---96338405351.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/bopefepu.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/mudusijiwunuzuxogamadup.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/wozuleduwubarirarujog.pdfIn PDF document text
    • http://webs123.com/userfiles/file/90169983571.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/89229795493.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/32849889972.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tk78lbll01fgl30fbpoo81c8u3/rogegozibaziparajixup.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/31525170333.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/99706557965.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/55879167234.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/742ca80fbe2ded37eddd6863d88a6a36/rajep.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///luzelumorukawejirabaju.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/boregiforilen.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/lunisamulabawopupa.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/2419273248.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/lobisuxogujirida.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/88774507302.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/zinemik.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/rozajarokeziperep.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/80288516101.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/83314137282.pdfIn PDF document text
    • http://dr-temt.ru/images/file/lulolexo.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_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 10620 bytes
SHA-256: cbe5549b4a36a1edf113f5b73ad3341ce7e263b301ba3f229d81cbf9f6e0aa6f
font_01_sfnt_off0000fb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001138f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 18528 bytes
SHA-256: d032118e61700814c990830fedafb688912d881d2e6c191ca61e7c65a686f300